typescript-generator: Classloader issues cause maven plugin (v1.14.251) to fail when using classesFromAutomaticJaxrsApplication

Using 1.14.251 of this plugin, we’ve been running into sporadic maven build issues that appear to be related to the classloading mechanism that’s used when the classesFromAutomaticJaxrsApplication flag is set to true. When running our multi-module maven build in parallel, the plugin will occasionally attempt to load a @Path annotated class that is from another module that isn’t a direct dependency of the project running the plugin. When it attempts to load the class, a java.lang.ClassNotFoundException is thrown and the build fails.

We had attempted to add the package of the class to the excludeClassPatterns, but that didn’t help due to the fact that the Input/JaxrsApplicationScanner classes perform their classloading before any filtering occurs. This is problematic because the FastClasspathScanner is occasionally finding classes that aren’t available to the thread context class loader. I was thinking there might be a couple of ways to address this:

1. Perform class exclusion filtering on the FastClasspathScanner using the constructor scan spec.
2. Perform exclusion filtering on class names found by the FastClasspathScanner before attempting to load them
3. Allow individual classloading failures to be suppressed without causing the entire plugin execution to fail

We can update to the latest version of the plugin, but from what I can tell, the classpath scanning/classloading mechanism hasn’t changed in a way that would prevent us from encountering this issue. This is the relevant stack trace from our CI server when this issue causes the build to fail:

12:20:30 org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal cz.habarta.typescript-generator:typescript-generator-maven-plugin:1.14.251:generate (generate) on project PROJECT: Execution generate of goal cz.habarta.typescript-generator:typescript-generator-maven-plugin:1.14.251:generate failed: Cannot load JAX-RS application. For more information see https://github.com/vojtechhabarta/typescript-generator/wiki/JAX-RS-Application.
12:20:30 	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
12:20:30 	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
12:20:30 	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
12:20:30 	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
12:20:30 	at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:185)
12:20:30 	at org.apache.maven.lifecycle.internal.builder.multithreaded.MultiThreadedBuilder$1.call(MultiThreadedBuilder.java:181)
12:20:30 	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
12:20:30 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
12:20:30 	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
12:20:30 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
12:20:30 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
12:20:30 	at java.lang.Thread.run(Thread.java:745)
12:20:30 Caused by: org.apache.maven.plugin.PluginExecutionException: Execution generate of goal cz.habarta.typescript-generator:typescript-generator-maven-plugin:1.14.251:generate failed: Cannot load JAX-RS application. For more information see https://github.com/vojtechhabarta/typescript-generator/wiki/JAX-RS-Application.
12:20:30 	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:145)
12:20:30 	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
12:20:30 	... 11 more
12:20:30 Caused by: java.lang.RuntimeException: Cannot load JAX-RS application. For more information see https://github.com/vojtechhabarta/typescript-generator/wiki/JAX-RS-Application.
12:20:30 	at cz.habarta.typescript.generator.JaxrsApplicationScanner.scanJaxrsApplication(JaxrsApplicationScanner.java:32)
12:20:30 	at cz.habarta.typescript.generator.Input.fromJaxrsApplication(Input.java:63)
12:20:30 	at cz.habarta.typescript.generator.Input.fromClassNamesAndJaxrsApplication(Input.java:82)
12:20:30 	at cz.habarta.typescript.generator.maven.GenerateMojo.execute(GenerateMojo.java:331)
12:20:30 	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
12:20:30 	... 12 more
12:20:30 Caused by: java.lang.ClassNotFoundException: com.package.RestAPI
12:20:30 	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
12:20:30 	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
12:20:30 	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
12:20:30 	at cz.habarta.typescript.generator.JaxrsApplicationScanner.scanClasspathForJaxrsResources(JaxrsApplicationScanner.java:50)
12:20:30 	at cz.habarta.typescript.generator.JaxrsApplicationScanner.scanJaxrsApplication(JaxrsApplicationScanner.java:24)
12:20:30 	... 16 more