Unraveling the Mystery: ServletException: java.lang.NoSuchMethodError: org.apache.jasper.runtime.JspRuntimeLibrary.releaseTag in Wildfly 13

Introduction

In the realm of Java web development, the seamless deployment of applications across various application servers is a crucial aspect. However, unexpected roadblocks can often arise, hindering the smooth transition of applications from one server to another. One such perplexing issue is the ServletException: java.lang.NoSuchMethodError: org.apache.jasper.runtime.JspRuntimeLibrary.releaseTag error, which specifically manifests when deploying applications to Wildfly 13.

This blog post aims to shed light on the root causes of this error and provide effective solutions to mitigate it. By understanding the underlying discrepancies between Tomcat and Wildfly 13's JSP compilation and execution environments, we can take the necessary steps to ensure successful deployment.

Understanding the Error

The NoSuchMethodError indicates that the Java Virtual Machine (JVM) cannot locate a specific method at runtime. In this case, the missing method is org.apache.jasper.runtime.JspRuntimeLibrary.releaseTag. This method is essential for the proper functioning of JSPs, particularly in the context of tag libraries and custom tags.

Root Causes

1. Classpath Conflicts and Dependency Issues:

   • Conflicting JARs: The presence of multiple versions of JAR files, especially those related to the Servlet API and JSP API, can lead to classpath conflicts. This can cause the JVM to load incorrect classes, resulting in the NoSuchMethodError.
   • Missing Dependencies: If the application relies on specific libraries or dependencies that are not properly included in the deployment environment, the necessary classes for JSP compilation and execution may be absent.
   • JSP Compiler Configuration: Wildfly 13's JSP compiler configuration may differ from that of Tomcat, leading to variations in the generated bytecode. This can result in compatibility issues, particularly when using custom tag libraries or complex JSP constructs.
   • Class Loading and Deployment: The way Wildfly 13 handles class loading and deployment can impact the availability of classes during runtime. Misconfigurations or inconsistencies in the deployment process can cause the NoSuchMethodError.
   • Check for Conflicting JARs: Use tools like mvn dependency:tree or gradle dependencyInsight to analyze the dependency tree and identify potential conflicts.
   • Ensure Necessary Dependencies: Verify that all required dependencies, including the Servlet API, JSP API, and any custom libraries, are included in the deployment.
   • Clean and Rebuild: Clean the project and rebuild it to ensure that the classpath is refreshed and dependencies are resolved correctly.
   • Check Compiler Configuration: Review the JSP compiler configuration in Wildfly 13 to ensure that it is compatible with the application's requirements.
   • Consider Using a Consistent Compiler: If possible, use the same JSP compiler version for both development and deployment environments to minimize compatibility issues.
   • Configure Deployment Scanners: Adjust the deployment scanner settings in Wildfly 13 to ensure that changes to JSP files are detected and recompiled as needed.
   • Optimize Class Loading: Explore options for optimizing class loading and deployment in Wildfly 13 to improve performance and reduce the likelihood of classloading-related issues.
   • Use a Debugger: Utilize a debugger to step through the code and identify the exact point where the NoSuchMethodError occurs.
   • Analyze Stack Traces: Examine the stack trace to pinpoint the root cause of the error and determine the missing method's origin.

2. JSP Compilation and Execution Differences:

Troubleshooting and Solutions

1. Verify Classpath and Dependencies:

2. Adjust JSP Compilation Settings:

3. Utilize Wildfly-Specific Configurations:

4. Leverage Debugging Tools:

Conclusion

The ServletException: java.lang.NoSuchMethodError: org.apache.jasper.runtime.JspRuntimeLibrary.releaseTag error can be a frustrating obstacle when deploying Java web applications to Wildfly 13. By understanding the underlying causes and following the troubleshooting steps outlined in this blog post, you can effectively address this issue and ensure successful deployment.

Remember to carefully analyze the application's dependencies, review the JSP compiler configuration, and leverage debugging tools to pinpoint the root cause of the error. By taking a systematic approach and considering the specific nuances of Wildfly 13's JSP compilation and execution environment, you can overcome this challenge and achieve smooth deployment of your Java web applications.