Examples of java.lang.instrument.Instrumentation

java.lang.instrument.Instrumentation
This class provides services needed to instrument Java programming language code. Instrumentation is the addition of byte-codes to methods for the purpose of gathering data to be utilized by tools. Since the changes are purely additive, these tools do not modify application state or behavior. Examples of such benign tools include monitoring agents, profilers, coverage analyzers, and event loggers.
There are two ways to obtain an instance of the Instrumentation interface:
1. When a JVM is launched in a way that indicates an agent class. In that case an Instrumentation instance is passed to the premain method of the agent class.
2. When a JVM provides a mechanism to start agents sometime after the JVM is launched. In that case an Instrumentation instance is passed to the agentmain method of the agent code.
These mechanisms are described in the {@linkplain java.lang.instrument package specification}.
Once an agent acquires an Instrumentation instance, the agent may call methods on the instance at any time. @since 1.5

        ClassLoader loader = new FilteredChildFirstClassLoader(getClass().getClassLoader(), "org.apache.openejb.core.cmp.jpa");


        PersistenceClassLoaderHandler persistenceClassLoaderHandler = new PersistenceClassLoaderHandler() {


            public void addTransformer(String unitId, ClassLoader classLoader, ClassFileTransformer classFileTransformer) {
                Instrumentation instrumentation = Agent.getInstrumentation();
                if (instrumentation != null) {
                    instrumentation.addTransformer(new ControllableTransformer(classFileTransformer));
                }
            }


            public void destroy(String unitId) {
            }

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        private final Map<String, List<ClassFileTransformer>> transformers = new TreeMap<String, List<ClassFileTransformer>>();


        @Override
        public void addTransformer(final String unitId, final ClassLoader classLoader, final ClassFileTransformer classFileTransformer) {
            final Instrumentation instrumentation = Agent.getInstrumentation();
            if (instrumentation != null) {
                instrumentation.addTransformer(classFileTransformer);


                if (unitId != null) {
                    List<ClassFileTransformer> transformers = this.transformers.get(unitId);
                    if (transformers == null) {
                        transformers = new ArrayList<ClassFileTransformer>(1);

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        @Override
        public void destroy(final String unitId) {
            final List<ClassFileTransformer> transformers = this.transformers.remove(unitId);
            if (transformers != null) {
                final Instrumentation instrumentation = Agent.getInstrumentation();
                if (instrumentation != null) {
                    for (final ClassFileTransformer transformer : transformers) {
                        instrumentation.removeTransformer(transformer);
                    }
                } else {
                    logger.error("assembler.noAgent");
                }
            }

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    public static void main(String args[]) throws IOException {
        JarFile bootclasses = new JarFile("BootSupport.jar");
        JarFile agentclasses = new JarFile("AgentSupport.jar");


        Instrumentation ins = Agent.getInstrumentation();


        // Test 1: Add BootSupport.jar to boot class path and check that
        // BootSupport is loaded by the bootstrap class loader
        ins.appendToBootstrapClassLoaderSearch(bootclasses);
        checkLoadedByLoader("BootSupport", null);


        // Test 2: Add AgentSupport.jar to the system class path and check that
        // AgentSupport is loaded by the system class loader.
        try {
            ins.appendToSystemClassLoaderSearch(agentclasses);
            checkLoadedByLoader("AgentSupport", ClassLoader.getSystemClassLoader());
        } catch (UnsupportedOperationException x) {
            System.out.println("System class loader does not support adding to class path");
        }

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        JarFile bootclasses = new JarFile("BootSupport.jar");
        JarFile agentclasses = new JarFile("AgentSupport.jar");


        Instrumentation ins = Agent.getInstrumentation();


        ins.appendToBootstrapClassLoaderSearch(bootclasses);
        try {
            new BootSupport();
            System.out.println("FAIL: BootSupport resolved");
            failures++;
        } catch (NoClassDefFoundError x) {
            System.out.println("PASS: BootSupport failed to resolve");
        }


        try {
            ins.appendToSystemClassLoaderSearch(agentclasses);
            try {
                new AgentSupport();
                System.out.println("FAIL: AgentSupport resolved");
                failures++;
            } catch (NoClassDefFoundError x) {

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        private final Map<String, List<ClassFileTransformer>> transformers = new TreeMap<String, List<ClassFileTransformer>>();


        @Override
        public void addTransformer(final String unitId, final ClassLoader classLoader, final ClassFileTransformer classFileTransformer) {
            final Instrumentation instrumentation = Agent.getInstrumentation();
            if (instrumentation != null) {
                instrumentation.addTransformer(classFileTransformer);


                if (unitId != null) {
                    List<ClassFileTransformer> transformers = this.transformers.get(unitId);
                    if (transformers == null) {
                        transformers = new ArrayList<ClassFileTransformer>(1);

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        @Override
        public void destroy(final String unitId) {
            final List<ClassFileTransformer> transformers = this.transformers.remove(unitId);
            if (transformers != null) {
                final Instrumentation instrumentation = Agent.getInstrumentation();
                if (instrumentation != null) {
                    for (final ClassFileTransformer transformer : transformers) {
                        instrumentation.removeTransformer(transformer);
                    }
                } else {
                    logger.error("assembler.noAgent");
                }
            }

View Full Code Here

        }
    }


    private static class Handler implements PersistenceClassLoaderHandler {
        public void addTransformer(String unitId, ClassLoader classLoader, ClassFileTransformer classFileTransformer) {
            Instrumentation instrumentation = Agent.getInstrumentation();
            if (instrumentation != null) {
                instrumentation.addTransformer(new Transformer(classFileTransformer));
            }
        }

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   * @param theClass the class
   * @param <T> the base class type
   * @return all the classes extending from the parameter. An empty collection will be returned if this java agent is not installed
   */
  public static <T> Collection<Class<? extends T>> instancesOf(Class<T> theClass) {
    Instrumentation aInst = instrumentation();


    if (aInst == null) {
      return Sets.newHashSet();
    }


    Set<Class<? extends T>> aClasses = Sets.newHashSet();


    for (Class<?> aCls : aInst.getAllLoadedClasses()) {
      if (theClass.isAssignableFrom(aCls)) {
        aClasses.add((Class<T>) aCls);
      }
    }

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   * Return all the classes which have the given annotation applied to them
   * @param theAnnotation the annotation
   * @return the classes with the annotation.  An empty collection will be returned if this java agent is not installed
   */
  public static Collection<Class<?>> annotatedWith(Class<? extends Annotation> theAnnotation) {
    Instrumentation aInst = instrumentation();
    if (aInst == null) {
      return Sets.newHashSet();
    }


    Set<Class<?>> aClasses = Sets.newHashSet();


    for (Class<?> aCls : aInst.getAllLoadedClasses()) {
      if (aCls.getAnnotation(theAnnotation) != null) {
        aClasses.add(aCls);
      }
    }

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