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Groovy example source code file (GroovyClassLoaderDeadlockTest.java)

This example Groovy source code file (GroovyClassLoaderDeadlockTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

binding, binding, groovyscriptengine, groovyscriptengine, interruptedexception, io, ioexception, path, runner, runner, runtimeexception, string, string, testcase, throwable

The Groovy GroovyClassLoaderDeadlockTest.java source code

package groovy.lang.gcldeadlock;

import groovy.lang.Binding;
import groovy.util.GroovyScriptEngine;
import junit.framework.TestCase;

import java.io.IOException;

 * Check that GroovyClassLoader (through GroovyScriptEngine) can compile scripts concurrently.
 * Test for GROOVY-4002
 * @author Guillaume Laforge
public class GroovyClassLoaderDeadlockTest extends TestCase {
    private static final String PATH = "./src/test/groovy/lang/gcldeadlock/";

    private static class Runner extends Thread {
        private GroovyScriptEngine gse;
        private String script;
        private int count;
        private String result = "";

        public Runner(GroovyScriptEngine gse, String script, int count) {
            this.gse = gse;
            this.script = script;
            this.count = count;

        public void run() {
            try {
                Binding b = new Binding();
                b.setVariable("number", count);
                result = (String) this.gse.run(script, b);
            } catch (Throwable t) {
                throw new RuntimeException("problem running script", t);

        public String getResult() {
            return result;

    public void testNoDeadlockWhenTwoThreadsCompileScripts() throws IOException, InterruptedException {
        String[] roots = new String[] { PATH };
        GroovyScriptEngine gse = new GroovyScriptEngine(roots);
        Runner[] runners = new Runner[] {
                new Runner(gse, "script0.groovy", 0),
                new Runner(gse, "script1.groovy", 1)
        for (Runner runner : runners) {
        for (Runner runner : runners) {
        assertEquals("0+0=0", runners[0].getResult());
        assertEquals("1+1=2", runners[1].getResult());

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