Question 1

Software platforms comparison (Web): JavaServer Pages (JSP) and Active Server Pages (ASP) may look syntactically similar in use, but do they rely on the same or genuinely similar underlying technology stacks on the server?

Accepted Answer

Introduction / Context: This question tests understanding of server-side web technologies. JSP (JavaServer Pages) is part of the Java EE ecosystem, while ASP originally referred to Microsoft Active Server Pages and later ASP.NET on the .NET platform. Although both render dynamic HTML and can appear similar in syntax within templates, their engines, lifecycles, and deployment stacks are distinct. Given Data / Assumptions: JSP compiles into servlets and runs on a Java servlet container or application server. ASP/ASP.NET runs inside Microsoft IIS using the .NET runtime (or classic ASP engine). Both can embed code in page-like files served over HTTP. Concept / Approach: Compare lifecycle and runtime: JSP pages are translated to Java servlets, compiled to bytecode, then executed by the JVM. ASP.NET pages are compiled to Intermediate Language and executed by the Common Language Runtime. Classic ASP is interpreted by its own engine. The request pipelines, configuration, and libraries differ substantially. Step-by-Step Solution: Identify each platform’s runtime (JVM vs. CLR/Classic ASP engine).Note the compilation/translation step (JSP to servlet vs. ASP.NET to IL).Compare hosting (Tomcat/Jetty/Jakarta vs. IIS).Evaluate libraries and APIs (Servlet API/JSP vs. ASP.NET framework).Conclude that similarity is mostly superficial (template look), not technical underpinnings. Verification / Alternative check: Check deployment artifacts: JSP uses .war/.ear with web.xml or annotations; ASP.NET uses .NET projects deployed to IIS with web.config and assemblies. Why Other Options Are Wrong: “Only true for ASP.NET MVC” or “only on old IIS” does not change the fundamental runtime difference. Common Pitfalls: Equating similar templating syntax with identical technology; ignoring runtime and server differences. Final Answer: Incorrect

Question 2

Vendor comparison claim: “MySQL is just as powerful as Oracle and costs half as much.” Evaluate the accuracy of this statement for enterprise database capabilities.

Accepted Answer

Introduction / Context: Comparing database systems involves features (partitioning, advanced indexing, RAC/cluster, in-memory options), manageability, scalability, security, and licensing models. Blanket statements about “power” and price oversimplify diverse enterprise needs. Given Data / Assumptions: Oracle Database includes a very broad feature set for mission-critical workloads (e.g., RAC, Data Guard, Flashback, advanced optimization). MySQL is widely used and powerful for many workloads, with variants and plugins (InnoDB, Group Replication, etc.). “Power” depends on workload characteristics and required features. Concept / Approach: Assess general capability breadth rather than single benchmarks. While MySQL is excellent for many web-scale applications, Oracle often offers richer enterprise features, mature tooling, and specific optimizations. Pricing also varies by editions, cloud options, and support contracts—“half the price” is not universally meaningful. Step-by-Step Solution: List critical requirements (HA, DR, encryption, sharding, analytics).Map requirements to native features of each DBMS.Consider total cost of ownership (licenses, support, staffing).Perform proof-of-concept on representative workloads.Decide based on measured outcomes, not slogans. Verification / Alternative check: Review vendor documentation and independent evaluations for required features; run load tests. Why Other Options Are Wrong: “Only correct for small sites” or “only on Linux” are still unfounded generalizations. Common Pitfalls: Equating popularity or initial cost with capability; ignoring operational maturity and support. Final Answer: Incorrect

Question 3

Terminology check: In Java, the acronym JDBC expands to “Java Database Connectivity.” Is this expansion correct?

Accepted Answer

Introduction / Context: JDBC is the standard Java API for connecting to relational databases. It defines interfaces for connections, statements, prepared statements, result sets, and drivers, enabling vendor-neutral data access. Given Data / Assumptions: Developers use JDBC drivers to communicate with DBMSs. APIs include java.sql and javax.sql packages. JDBC supports SQL execution, transactions, and metadata access. Concept / Approach: Confirm the acronym: JDBC = Java Database Connectivity. It is analogous to ODBC in concept, but for Java and with its own driver types and interfaces. Step-by-Step Solution: Create a JDBC URL and load a driver (driver auto-loading in modern Java).Obtain a Connection via DriverManager or a DataSource.Prepare and execute SQL using Statement/PreparedStatement.Process ResultSet and manage transactions with commit/rollback.Close resources in finally/try-with-resources. Verification / Alternative check: Check the official Java documentation where the phrase “Java Database Connectivity” is defined. Why Other Options Are Wrong: “Java Data Connector” and “Java Datastore Connectivity” are not official expansions. Common Pitfalls: Confusing JDBC with JPA/Hibernate; mixing driver types and connection URLs. Final Answer: Correct

Question 4

MySQL design feature: In MySQL, surrogate key columns typically use the AUTO_INCREMENT property to generate sequential identifiers. Is that statement accurate?

Accepted Answer

Introduction / Context: Surrogate keys are system-generated identifiers that uniquely identify rows. In MySQL, AUTO_INCREMENT is a common mechanism for producing such numeric keys without client-side generation. Given Data / Assumptions: A column is defined as an integer type with AUTO_INCREMENT. Each insert without an explicit value produces the next sequence number. Engines such as InnoDB fully support AUTO_INCREMENT semantics. Concept / Approach: Using AUTO_INCREMENT simplifies key management and avoids collisions. It is distinct from natural keys and from GUID/UUID strategies. AUTO_INCREMENT may have configuration nuances (increment step, starting value, behavior under replication). Step-by-Step Solution: Define a table with id INT PRIMARY KEY AUTO_INCREMENT.Insert rows without specifying id.Retrieve generated values via LAST_INSERT_ID().Adjust starting values with ALTER TABLE ... AUTO_INCREMENT = n.Consider uniqueness and gaps under rollbacks or deletes. Verification / Alternative check: Run sample DDL/DML and observe increasing identifiers. Why Other Options Are Wrong: Support is not limited to legacy engines or versions; modern MySQL/InnoDB support this feature robustly. Common Pitfalls: Assuming sequential without gaps; relying on order semantics of generated values. Final Answer: Correct

Question 5

Java Applet concept: An applet is Java bytecode sent over HTTP and then “invoked using the HTTP protocol” on the user’s computer. Is that characterization correct?

Accepted Answer

Introduction / Context: Applets were client-side Java programs embedded in web pages and executed in a browser’s JVM plugin or applet viewer. While distribution typically occurred via HTTP, execution was performed by the local JVM under a security sandbox, not by HTTP itself. Given Data / Assumptions: Applets are delivered as .class or .jar files referenced by HTML tags. The browser downloads resources over HTTP(S). Execution occurs locally inside the Java plugin/JVM, not via the network protocol. Concept / Approach: Distinguish transport from execution: HTTP transports bytes; the JVM executes bytecode. The statement confuses these roles, implying that HTTP “invokes” the program, which is inaccurate. Step-by-Step Solution: Load a page with an applet tag referencing a .jar.Browser fetches the file via HTTP/HTTPS.The JVM plugin loads classes and executes start() under security policies.User interacts locally; network calls (if any) use sockets/HTTP as coded.Termination occurs via stop()/destroy() lifecycle methods. Verification / Alternative check: Observe that applets can run offline once downloaded (subject to policy), further showing execution is not “by HTTP.” Why Other Options Are Wrong: Signed status, old browsers, or versions do not make HTTP the execution engine. Common Pitfalls: Conflating delivery protocol with runtime; overlooking sandbox restrictions. Final Answer: Incorrect

Question 6

Driver taxonomy: Historically, Sun/Java defined four JDBC driver types (Type 1 through Type 4). Is this historical statement correct?

Accepted Answer

Introduction / Context: JDBC drivers were categorized into four types, describing how Java applications communicate with databases. Knowing these types clarifies deployment dependencies and performance characteristics. Given Data / Assumptions: Type 1: JDBC-ODBC bridge. Type 2: Native-API partly Java. Type 3: Net-protocol all-Java middleware. Type 4: Native-protocol all-Java (direct to DBMS). Concept / Approach: Types signal trade-offs: portability vs. reliance on native code or middleware. Modern practice favors Type 4 for simplicity and portability; the old JDBC-ODBC bridge is deprecated/removed. Step-by-Step Solution: Identify DBMS vendor’s driver type.Prefer Type 4 where possible for all-Java stacks.Avoid legacy Type 1 in modern JVMs.Validate features (XA, SSL, batching) per driver.Test performance with representative workloads. Verification / Alternative check: Consult vendor docs; confirm driver class and connection URL reflect a Type 4 implementation in most modern stacks. Why Other Options Are Wrong: There were not two or five official categories; the canonical set is four. Common Pitfalls: Assuming “Type 4” always outperforms others without testing; ignoring SSL/cert requirements. Final Answer: Correct

Question 7

JVM execution model: “The Java Virtual Machine interprets Java bytecode at runtime.” Is this statement essentially correct, considering modern JIT optimizations?

Accepted Answer

Introduction / Context: The JVM executes Java bytecode. Historically, interpretation was the baseline; modern JVMs add Just-In-Time compilation and adaptive optimizations. Still, conceptually, the JVM reads bytecode instructions and executes them at runtime. Given Data / Assumptions: Class files contain platform-neutral bytecode. The JVM can interpret or JIT-compile hot methods to native code. Execution remains managed by the JVM (GC, security, verification). Concept / Approach: Differentiate between interpretation (directly executing bytecode) and JIT (translating hot paths into native code). Both occur at runtime under the JVM’s control, so the statement is essentially correct from a high-level perspective. Step-by-Step Solution: Class loading and verification.Interpreter executes methods initially.Profiler detects hot spots.JIT compiles hot code to native and inlines/optimizes.Garbage collector manages memory during execution. Verification / Alternative check: Use JVM flags to view compilation logs; observe both interpreted and compiled phases. Why Other Options Are Wrong: Limiting correctness to specific versions or editions ignores the general runtime model. Common Pitfalls: Assuming “interpreted” means “slow” without JIT consideration; confusing AOT/JIT trade-offs. Final Answer: Correct

Question 8

Server components: A Java servlet is executed on the Web server and is invoked via HTTP requests that reach the server. Is this characterization accurate?

Accepted Answer

Introduction / Context: Servlets are server-side Java components that handle requests and generate responses, typically over HTTP. They run inside a servlet container such as Tomcat or a Java EE application server. Given Data / Assumptions: Client sends an HTTP request to the server. Servlet container routes the request to a mapped servlet. Servlet code executes on the server and returns a response. Concept / Approach: Servlets implement doGet/doPost and related methods, reading request parameters and writing to the response stream. They are the foundation for higher-level frameworks (JSP, JSF, Spring MVC). Step-by-Step Solution: Client issues HTTP request to a URL mapped to a servlet.Container constructs HttpServletRequest/Response objects.Servlet method executes server-side logic (I/O, DB calls).Servlet writes response; container returns it to client.Lifecycle methods init/destroy manage resources. Verification / Alternative check: Inspect server logs or add logging to confirm server-side execution. Why Other Options Are Wrong: Servlets are not client-side; SOAP is unrelated to whether HTTP invokes the servlet. Common Pitfalls: Assuming servlets run in the browser; confusing servlet with applet. Final Answer: Correct

Question 9

Portability claim: “Java bytecode is machine-specific code.” Evaluate this statement about Java’s compilation target.

Accepted Answer

Introduction / Context: Java compiles source into bytecode stored in .class files. The core promise is “write once, run anywhere,” relying on a platform-specific JVM to execute the same bytecode across architectures. Given Data / Assumptions: Bytecode targets a virtual machine, not a physical CPU ISA. Different OS/CPU platforms provide their own JVM implementations. The same .class/.jar runs on any compatible JVM. Concept / Approach: Machine-specific code is native binary tied to an instruction set. Bytecode is an intermediate, machine-independent representation interpreted/JIT-compiled by the JVM at runtime to the host architecture. Step-by-Step Solution: Compile Hello.java to Hello.class.Copy to Windows, Linux, macOS.Run with their respective JVMs; observe identical behavior.Note no recompilation is required.Understand JIT produces machine-specific native code at runtime, not at compile time. Verification / Alternative check: Run the same JAR across platforms; bytecode remains unchanged. Why Other Options Are Wrong: It is not “correct for x86” or “Android only”; the concept is VM portability. Common Pitfalls: Confusing bytecode with native binaries; assuming portability implies identical performance. Final Answer: Incorrect

Question 10

JSP authoring model: “With JavaServer Pages (JSP), all coding is done in Java and only in Java.” Assess this claim considering JSP tags, Expression Language (EL), and templating.

Accepted Answer

Introduction / Context: JSP is a view technology that mixes template markup with server-side behavior. While early JSP encouraged scriptlets (embedded Java), modern JSP emphasizes tag libraries and Expression Language to reduce Java code in pages. Given Data / Assumptions: JSP files commonly contain HTML or other markup. JSTL and custom tags encapsulate logic without raw Java. EL provides concise access to attributes and beans. Concept / Approach: The claim “only in Java” is incorrect. JSP supports multiple constructs: static markup, JSP directives, standard/custom tags, and EL. Java classes (servlets, beans, tag handlers) implement behavior outside the JSP view, promoting separation of concerns. Step-by-Step Solution: Design the view with HTML/CSS.Use JSTL core tags for iteration/conditions instead of scriptlets.Bind model data via request/session attributes and EL.Move complex logic into Java classes (controllers, services).Configure via web.xml or annotations; JSP compiles to a servlet. Verification / Alternative check: Inspect typical JSPs in modern projects: minimal or no raw Java, heavy use of tags/EL. Why Other Options Are Wrong: Restricting to scriptlets is outdated and not required; pre–JSP 2.0 still allowed tags. Common Pitfalls: Embedding business logic in JSPs; overusing scriptlets and hurting maintainability. Final Answer: Incorrect

Question 11

In Java database connectivity (JDBC) terminology, is the Type 1 driver correctly described as the JDBC–ODBC bridge driver? Provide the most accurate judgment about this statement, considering typical usage and deprecation history.

Accepted Answer

Introduction / Context: This question checks core knowledge of JDBC driver classifications. Understanding the four historical JDBC driver types is essential when maintaining legacy code, analyzing performance, or planning migrations away from deprecated components. Given Data / Assumptions: The statement claims: “JDBC Type 1 drivers are JDBC–ODBC bridge drivers.” We assess the claim against the canonical JDBC taxonomy (Types 1–4). Environment specifics (OS, DBMS vendor, Java version) do not change the formal definition of driver types. Concept / Approach: JDBC drivers were historically grouped as follows: Type 1 (JDBC–ODBC bridge), Type 2 (native-API partly Java), Type 3 (net-protocol, middleware), and Type 4 (pure Java, database-protocol). Type 1 relies on an ODBC driver on the client and acts as a bridge from JDBC calls to ODBC calls. Step-by-Step Solution: Identify the definition of Type 1: JDBC calls translated to ODBC.Confirm that the bridge requires local ODBC drivers and appropriate native libraries.Conclude that “Type 1 = JDBC–ODBC bridge” is the standard, correct mapping.Note that modern Java versions removed the old bridge, but the definition remains accurate. Verification / Alternative check: Cross-check any JDBC summary table: Type 1 is always listed as the JDBC–ODBC bridge. Even though deprecated/removed, legacy docs uniformly agree on this mapping. Why Other Options Are Wrong: “Invalid (Type 1 is pure Java thin)”: Pure Java thin is Type 4, not Type 1. “Depends on vendor / OS / Java 11+” does not alter the driver type definitions. Common Pitfalls: Confusing Type 1 (bridge) with Type 4 (thin); assuming deprecation changes the definition rather than support status. Final Answer: Valid (Type 1 is the JDBC–ODBC bridge driver)

Question 12

Web containers and servlet support: does the standalone Apache HTTP Server “not support servlets”? Evaluate the statement considering common integration with servlet containers such as Apache Tomcat.

Accepted Answer

Introduction / Context: This item distinguishes between a plain web server (Apache HTTP Server, often called “httpd”) and a Java servlet container (for example, Apache Tomcat). Understanding the boundary between static HTTP serving and Java servlet execution is vital for architecture and deployment decisions. Given Data / Assumptions: The statement says: “Apache Web server does not support servlets.” “Apache Web server” refers to Apache HTTP Server, not Tomcat. Real-world setups often combine Apache HTTP Server and Tomcat via connectors. Concept / Approach: Apache HTTP Server does not natively execute Java servlets. Servlets run inside a servlet container compliant with the Java Servlet specification. However, Apache can front and forward requests to Tomcat using connectors such as mod_jk, mod_proxy_ajp, or mod_proxy_http. In practice, Apache participates in serving servlet-based applications through this integration, so the absolute statement “does not support servlets” is misleading and therefore incorrect. Step-by-Step Solution: Recognize that servlet execution requires a Java EE/Servlet container.Note that Apache HTTP Server can proxy requests to Tomcat where servlets execute.Thus, with standard integration, Apache can deliver servlet-powered sites.Conclude the blanket claim is invalid. Verification / Alternative check: Typical production stacks use Apache for static content and SSL termination, forwarding dynamic servlet requests to Tomcat/Jetty/Payara. Why Other Options Are Wrong: “Never runs any servlet in any configuration” ignores common Apache–Tomcat setups. OS, HTTP/2, or keep-alive settings do not determine servlet support. Common Pitfalls: Equating Apache HTTP Server with Tomcat; assuming “support” means “executes directly” rather than “supports through integration.” Final Answer: Invalid (Apache can serve servlets via integration with a servlet container)

Question 13

Pronunciation of “MySQL”: is saying “my See-quel” universally correct? Judge the accuracy of this claim with respect to the project’s own guidance.

Accepted Answer

Introduction / Context: Technical terminology often develops colloquial pronunciations. This question assesses knowledge of the commonly accepted versus project-preferred pronunciation for “MySQL,” a popular open-source relational database system. Given Data / Assumptions: The statement asserts only “my See-quel.” Project guidance acknowledges multiple pronunciations but expresses a preference. Correctness should reflect the official recommendation rather than informal usage alone. Concept / Approach: Historically, the MySQL project documentation notes that both “My Ess Cue Ell” and “My Sequel” are heard. However, the preferred/official form is to pronounce each letter: “My Ess Cue Ell.” Therefore, saying that “MySQL is pronounced ‘my See-quel’” as a definitive, exclusive rule is inaccurate. Step-by-Step Solution: Identify the two common pronunciations in the community.Check the project’s stated preference (spelling out the letters).Assess exclusivity of the claim “is pronounced…”Conclude that the claim is invalid as a universal rule. Verification / Alternative check: Reference project FAQs or official style guidelines that indicate “My Ess Cue Ell” as preferred, while accepting that “My Sequel” also occurs in practice. Why Other Options Are Wrong: Platform, version, or storage engines have no bearing on pronunciation. Claiming the “only correct” pronunciation ignores official guidance. Common Pitfalls: Treating community habits as authoritative or assuming language localization alters the official recommendation. Final Answer: Invalid (officially “My Ess Cue Ell”; “My Sequel” is common but not the preferred form)

Question 14

MySQL system databases and metadata: does MySQL keep its metadata in a database named “meta_sql”? Evaluate this claim against current and historical defaults.

Accepted Answer

Introduction / Context: Understanding where a DBMS stores metadata helps DBAs query object definitions, privileges, and performance statistics. MySQL provides well-known system schemas for this purpose; confusing their names may lead to incorrect administrative queries. Given Data / Assumptions: The claim says MySQL keeps metadata in “meta_sql.” We compare this with actual MySQL system schemas. We consider mainstream MySQL distributions. Concept / Approach: MySQL uses several system schemas: information_schema (virtual metadata views), performance_schema (instrumentation), and the mysql schema (users, privileges, time zone tables, and other internal data). There is no standard schema named “meta_sql.” Therefore, the statement is incorrect. Step-by-Step Solution: List system schemas in a stock MySQL instance: information_schema, performance_schema, mysql, sys (helper views).Identify that metadata about tables, columns, and routines is obtained from information_schema views.Conclude that “meta_sql” is not a MySQL system database.Therefore, the claim is invalid. Verification / Alternative check: Run SHOW DATABASES; inspect the presence of the documented system schemas and the absence of “meta_sql.” Why Other Options Are Wrong: OS, engine, or fork do not create a “meta_sql” schema by default. Common Pitfalls: Confusing MySQL system schemas with SQL Server’s system databases or assuming custom admin-created schemas are universal. Final Answer: Invalid (MySQL stores metadata in information_schema and related system schemas, not “meta_sql”)

Question 15

JDBC driver suitability for web clients: can Type 3 and Type 4 JDBC drivers be used with servlets and with applets (where applicable)? Decide whether the statement is accurate.

Accepted Answer

Introduction / Context: Web-tier Java applications (servlets) and legacy client-side Java applets historically favored driver types that avoided native dependencies. This question tests recognition of which JDBC driver categories fit that bill. Given Data / Assumptions: Servlets run in a Java web container on the server. Applets (now obsolete) ran in a sandboxed client browser JVM. Drivers requiring native libraries are unsuitable or inconvenient for these use cases. Concept / Approach: Type 3 drivers are net-protocol, middleware-based, pure Java; Type 4 drivers are pure Java “thin” drivers that speak the database protocol directly. Both avoid client-side native code and ODBC. Therefore, they are appropriate for servlets and, historically, for applets, subject to security and distribution constraints. Type 1 needs ODBC; Type 2 uses native libraries—both are problematic in these scenarios. Step-by-Step Solution: Identify driver characteristics: Type 3 and Type 4 are pure Java.Map to runtime: web/app clients benefit from no native dependencies.Conclude suitability for servlets (server-side) and historically applets (client-side).Therefore the statement is valid. Verification / Alternative check: Review vendor documentation for popular JDBC drivers (Oracle thin, PostgreSQL, MySQL Connector/J): all are Type 4 and widely used in servlets. Why Other Options Are Wrong: Type 2 requires native code; ODBC is unrelated for Type 3/4. Suitability is not restricted to a single DBMS or OS. Common Pitfalls: Confusing “applet” constraints with “servlet” constraints; overlooking security policy requirements for client-side deployment. Final Answer: Valid (Type 3 and Type 4 are pure Java approaches suitable for servlets and historically for applets)

Question 16

Language compatibility and drivers: since Java and C/C++ are “close,” is a database driver unnecessary? Evaluate this statement in the context of JDBC and DBMS connectivity.

Accepted Answer

Introduction / Context: Programming language similarity does not imply wire-protocol compatibility with a database. This question reinforces that database connectivity requires a driver that implements the database’s protocol and JDBC interfaces, regardless of language similarities. Given Data / Assumptions: Java applications must connect to a DBMS. JDBC defines standard interfaces. DBMS vendors expose proprietary or standardized network protocols. Concept / Approach: JDBC drivers translate JDBC calls into the DBMS’s native protocol (Type 4) or into intermediate protocols/libraries (Types 1–3). Language syntax resemblance to C/C++ is irrelevant; without a driver, the JVM has no way to speak the DBMS protocol, authenticate, or marshal data correctly. Step-by-Step Solution: Identify the role of a JDBC driver: implement java.sql interfaces and network protocol.Note that C/C++ clients use different libraries (for example, OCI, libpq) rather than Java APIs.Conclude that a driver is necessary in Java to connect to relational databases.Therefore the claim is invalid. Verification / Alternative check: Attempting Connection without a driver class results in exceptions; adding the proper JDBC driver resolves connectivity. Why Other Options Are Wrong: OS or REST exposure does not negate JDBC driver needs for JDBC access. Embedded databases still use drivers (for example, H2, Derby) even if in-process. Common Pitfalls: Assuming language similarity implies binary compatibility; conflating JDBC with generic HTTP APIs. Final Answer: Invalid (you still need a JDBC driver to speak the DBMS protocol)

Question 17

JSP technology: do JavaServer Pages (JSP) enable creation of dynamic web pages using HTML mixed with Java code and tags? Provide the most accurate evaluation.

Accepted Answer

Introduction / Context: JavaServer Pages (JSP) is a server-side technology that compiles to servlets, enabling dynamic content generation in web applications. This question tests a foundational understanding of what JSP is intended to do. Given Data / Assumptions: JSP supports HTML markup combined with JSP tags and Expression Language (EL). JSPs are executed on the server within a servlet container. Output is dynamic HTML (or other text formats) sent to the browser. Concept / Approach: A JSP page is translated to a servlet by the container. It may contain directives, scriptlets (legacy), tag libraries (JSTL), and EL to bind to Java objects. This architecture enables creation of dynamic web pages that mix presentation with server-side logic (modern best practice favors EL and tag libraries rather than scriptlets). Step-by-Step Solution: Client requests a .jsp resource.Container compiles the JSP to a servlet on first use.Servlet executes Java logic and produces dynamic HTML.Browser receives rendered content independent of server platform. Verification / Alternative check: Inspect the work directory of a servlet container (for example, Tomcat) to see generated servlet code from JSPs. Why Other Options Are Wrong: JSPs are not limited to static HTML; they are expressly for dynamic content. OS, ODBC, and browser versions are unrelated to core JSP capability. Common Pitfalls: Overusing scriptlets instead of EL or tag libraries; mixing heavy business logic directly into JSPs rather than controllers. Final Answer: Valid (JSPs allow dynamic pages using HTML plus Java/JSP tags)

Question 18

Platform independence: although Java is machine-independent, are JSPs themselves not machine-independent? Assess the claim in the context of servlet containers and bytecode portability.

Accepted Answer

Introduction / Context: JSPs are part of the Java web stack. Like Java classes, JSPs ultimately execute as bytecode inside a servlet container, which runs on any OS with a compatible JVM. This question examines whether JSPs lose Java’s portability benefits. Given Data / Assumptions: A standard Java servlet container (for example, Tomcat, Jetty) is available. The application does not rely on OS-specific native libraries. Java bytecode portability applies. Concept / Approach: A JSP is translated into a Java servlet and compiled to bytecode. The same .war file can be deployed on any supported OS where the container and JVM run. Any departure from portability stems from the application’s own native dependencies, not from JSP technology itself. Therefore, claiming JSPs are not machine-independent is incorrect. Step-by-Step Solution: JSP request enters container.Container translates JSP to a servlet and compiles to .class files.The servlet executes on the JVM, which is cross-platform.Hence, JSPs retain Java’s portability properties. Verification / Alternative check: Deploy the same WAR on Windows, Linux, and macOS Tomcat instances; behavior is identical given the same JVM and configuration. Why Other Options Are Wrong: Browser engines and OS choices are irrelevant to server-side execution. JDBC driver type does not negate JVM-level portability. Common Pitfalls: Confusing server-side portability with client-side differences; relying on native binaries in the app, which do reduce portability. Final Answer: Invalid (JSPs compile to servlets/bytecode and are platform-independent under a JVM)

Question 19

JDBC Type 2 drivers: do they connect through the native API of the target DBMS? Decide whether the statement is correct, and consider deployment implications.

Accepted Answer

Introduction / Context: Knowing the differences among JDBC driver types helps diagnose classpath/native library issues and informs deployment strategies. Type 2 drivers are distinct because they rely on native client libraries provided by the DBMS vendor. Given Data / Assumptions: The claim: “Type 2 drivers connect to the native API of the DBMS.” We compare this to the canonical JDBC driver taxonomy. We consider cross-platform deployment constraints. Concept / Approach: Type 2 drivers are part Java and part native code; they call a DBMS’s native client API (for example, Oracle OCI). This requires installing the vendor’s client libraries on the host. In contrast, Type 4 drivers are pure Java and speak the database wire protocol directly. Thus, the statement about Type 2 is correct. Step-by-Step Solution: Identify that Type 2 requires vendor native libraries.Map consequence: environment must ship matching native binaries.Contrast with Type 4 which avoids native dependencies.Conclude the claim is valid. Verification / Alternative check: Attempt to load a Type 2 driver without native libs results in UnsatisfiedLinkError; installing the vendor client resolves it. Why Other Options Are Wrong: Type 2 is not pure Java thin; ODBC is unrelated to Type 2; it is not restricted to a single vendor or embedded databases. Common Pitfalls: Packaging apps without required native libraries; confusing Type 2 with the deprecated Type 1 bridge. Final Answer: Valid (Type 2 uses a native DBMS API accessed from Java)

Question 20

Java compilation targets: are Java programs compiled into portable bytecode that runs on a Java Virtual Machine (JVM)? Evaluate this foundational statement.

Accepted Answer

Introduction / Context: Java’s “write once, run anywhere” promise originates from compiling source code into a platform-neutral intermediate form called bytecode. This bytecode executes on any compatible Java Virtual Machine (JVM), enabling broad portability across operating systems and hardware. Given Data / Assumptions: The statement says Java programs are compiled into bytecode. We focus on the standard javac toolchain and conventional deployment. Alternative toolchains (for example, ahead-of-time native image) do not negate the general rule. Concept / Approach: The javac compiler converts .java files into .class files containing JVM bytecode. The JVM loads these classes, verifies them, and executes them using interpretation and/or just-in-time compilation. While newer technologies can compile Java to native binaries, the canonical model remains bytecode to JVM execution, which underpins Java’s portability and security model. Step-by-Step Solution: Write Java source (.java).Compile with javac to produce .class bytecode files.Run with java (the JVM) which loads and executes bytecode.Benefit from cross-platform portability through consistent JVM implementations. Verification / Alternative check: Inspect compiled output: .class files contain bytecode; tools like javap display bytecode instructions, confirming the compilation target. Why Other Options Are Wrong: Java does not “only” compile to native machine code; that is optional via specialized tools. Bytecode applies broadly (apps, libraries, tests), not only applets or Android. Common Pitfalls: Confusing JVM bytecode with CPU-specific machine code; assuming Android uses standard JVM bytecode (Android uses DEX/ART but the principle of intermediate bytecode remains similar). Final Answer: Valid (Java source compiles to bytecode executed by the JVM)

JDBC, Java Server Pages, and MySQL Questions