Why Does My Servlet Deployment Result in a java.lang.VerifyError on JBoss?

Causes of java.lang.VerifyError

Problem:

When deploying a servlet on a JBoss server compiled with JDK 1.5.0_11, a java.lang.VerifyError occurs. The error persists even after recompiling with JDK 1.5.0_15.

Possible Cause:

java.lang.VerifyError can arise when there's a discrepancy between the library versions used during compilation and runtime.

Explanation:

At compile-time, the code is checked against the methods and class signatures present in the library used. However, during runtime, if a different library is utilized, the actual method signatures and class definitions might differ from those used at compilation. This can lead to VerifyError.

Solution:

Ensure that the library version used during compilation matches the one present on the classpath at runtime. Verify the classpath and ensure that the correct library is being referenced.

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