-Dgroovy.use.classvalue=true
-XX:+ClassUnloadingWithConcurrentMark
-XX:+CMSScavengeBeforeRemark
-XX:+ScavengeBeforeFullGC
-XX:ParallelGCThreads=2
-XX:MetaspaceSize=50M
-XX:MaxMetaspaceSize=50M
-XX:CompressedClassSpaceSize=30M
-XX:MinMetaspaceFreeRatio=0
-XX:MaxMetaspaceFreeRatio=100
Test executed with class GroovyMemoryLeakWithoutClose which execute a dynamic groovy script without nothing safely close operation
GroovyCodeSource groovyCodeSource = new GroovyCodeSource(script, "SCRIPT", GroovyShell.DEFAULT_CODE_BASE);
GroovyClassLoader groovyClassLoader = new GroovyClassLoader();
Class groovyClass = groovyClassLoader.parseClass(groovyCodeSource, false);
Script groovyScript = InvokerHelper.createScript(groovyClass, binding);
groovyScript.run();
Test executed with class GroovyMemoryLeakWithClose which execute a dynamic groovy script with some safely close operation
Used these methods from GroovySystem at startup
GroovySystem.setKeepJavaMetaClasses(false);
GroovySystem.stopThreadedReferenceManager();
A short description of follow code:
- Create a temp file with the script groovy
- Create an empty UrlClassLoader
- Create a new GroovyClassLoader from UrlClassLoader
- Load groovy script from file
- Execute groovy script
- Close all classloader
- Delete the temp file
String groovyFilename = "script-" + UUID.randomUUID() + ".groovy";
FileOutputStream fileOutputStream = new FileOutputStream(groovyFilename);
fileOutputStream.write(script.getBytes(StandardCharsets.UTF_8));
fileOutputStream.close();
GroovyCodeSource groovyCodeSource = new GroovyCodeSource(new File(groovyFilename));
groovyCodeSource.setCachable(false);
URLClassLoader urlClassLoader = URLClassLoader.newInstance(new URL[]{});
GroovyClassLoader groovyClassLoader = new GroovyClassLoader(urlClassLoader);
Class groovyClass = groovyClassLoader.parseClass(groovyCodeSource, false);
Script groovyScript = InvokerHelper.createScript(groovyClass, binding);
groovyScript.run();
GroovySystem.getMetaClassRegistry().removeMetaClass(groovyScript.getMetaClass().getTheClass());
GroovySystem.getMetaClassRegistry().removeMetaClass(groovyClass);
groovyClassLoader.clearCache();
groovyClassLoader.clearAssertionStatus();
groovyClassLoader.close();
urlClassLoader.clearAssertionStatus();
urlClassLoader.close();
Files.deleteIfExists(Paths.get(groovyFilename));
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