Can Java 1.4 Code Compile on Java 5 Without Rebuilding Stubs?

Access Restriction on Required Library rt.jar: Can Java 1.4 Code Be Compiled on Java 5 Without Recreating Stubs?

When attempting to compile Java 1.4 code generated by IBM's WSDL2Java on Java 5 without recreating the stubs, an access restriction error may occur in Eclipse. The error, "Access restriction: The type QName is not accessible due to restriction on required library rt.jar," indicates that the required library's (rt.jar) access is restricted.

This issue arises because the stubs generated for Java 1.4 code may use classes from the Java 1.4 runtime, which is different from the runtime used by Java 5. The rt.jar library included with Java 5 may not contain the necessary classes for the generated code to compile successfully.

Alternative Solution to Recreating Stubs

There is an alternative solution to this issue without the need to recreate the stubs. The steps are as follows:

1. Open the project properties and go to "Build Path."
2. Remove the "JRE System Library."
3. Add the "JRE System Library" back by selecting it from the "Add Library" options.

This solution works because multiple classes from different jar files may be present in the project. Removing and re-adding the JRE System Library ensures that the correct classes are prioritized.

Ensuring Fundamental Solution

For a more fundamental solution, ensure that the jar files containing the same classes are excluded from the project. This will prevent conflicts between classes from different sources, ensuring that the required classes from the JRE System Library are used.

Example:

In the case where javax.xml.soap.SOAPPart is present in three jar files (axis-saaj-1.4.jar, saaj-api-1.3.jar, and rt.jar), excluding the first two jar files will guarantee that the SOAPPart class from the JRE System Library is used, resolving the access restriction error.

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