I am using ASM 5.2 for an example project and I want to compile the project which has as dependacy the ASM library.
The java file i am trying to compile is the following:
import java.io.FileInputStream;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.MethodVisitor;
import static org.objectweb.asm.Opcodes.ASM5;
public class Parser2 {
public static void main(final String args[]) throws Exception {
FileInputStream inputFile = new FileInputStream("/src/Test.class");
ClassReader reader = new ClassReader(inputFile);
GraphClass gc = new GraphClass();
reader.accept(gc, 0);
}
}
class GraphClass extends ClassVisitor {
public GraphClass() {
super(ASM5);
}
public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions) {
GraphMethod newVisitor = new GraphMethod(name);
return newVisitor;
//return super.visitMethod(access, name, desc, signature,exceptions);
}
}
class GraphMethod extends MethodVisitor{
public String MthName;
public GraphMethod(String name) {
super(ASM5);
MthName = name;
}
public void visitMethodInsn(int opcode, java.lang.String owner, java.lang.String name, java.lang.String descriptor, boolean isInterface) {
System.out.println(owner + "." + MthName + " ===> " + owner + "." + name);
}
}
I compile it with
javac -classpath asm-all-5.2.jar Parser2.java
which creates the class files GraphClass.class, GraphMethod.class and Parser2.class.
Then upon executing the Parser2 the following error comes up.
$ java Parser2
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: org/objectweb/asm/ClassVisitor
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
at java.lang.Class.getMethod0(Class.java:3018)
at java.lang.Class.getMethod(Class.java:1784)
at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: org.objectweb.asm.ClassVisitor
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
... 7 more
Why does it say it cannot find the ClassVisitor?
java version in use openjdk version "1.8.0_252"
Related
I have a program, that downloads a Git repository, builds it and launches defined Main class. It works properly with ordinary projects, but when I want to launch a JavaFX project, I get strange errors like:
Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at Main.main(Main.java:31)
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: app.UI_Main
at javafx.application.Application.launch(Application.java:260)
at app.UI_Main.main(UI_Main.java:31)
... 5 more
Caused by: java.lang.ClassNotFoundException: app.UI_Main
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at javafx.application.Application.launch(Application.java:248)
... 6 more
My Main class is:
public class Main {
private static final String GIT_ADDRESS = "https://github.com/lerryv/CheckCheckerDesktop";
private static final String MAIN_PATH = "app/";
private static final String MAIN_CLASS = "app.UI_Main";
public static void main(String[] args) throws GitAPIException, IOException, ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IllegalAccessException {
Git.cloneRepository().setURI(GIT_ADDRESS).setDirectory(Paths.get("./dir/").toFile()).call();
Collection<String> result = compile(Paths.get("./dir/src/").toFile());
String command = System.getProperty("java.home") + "/../bin/javac -d dirOut -cp \".:json-simple-1.1.jar\" " + result.join(" ");
Runtime.getRuntime().exec(command);
URLClassLoader urlClassLoader = URLClassLoader.newInstance(
new URL[]{
new File("dirOut/").toURI().toURL()
}
);
Class clazz = urlClassLoader.loadClass(MAIN_CLASS);
Method main = clazz.getDeclaredMethod("main", String[].class);
assert Modifier.isStatic(main.getModifiers());
main.invoke(null, (Object) args);
}
private static Collection<String> compile(File directory) {
assert directory.isDirectory();
Collection<String> result = new Collection<>();
boolean hasFiles = false;
for (File file: directory.listFiles()) {
if (file.isDirectory()) {
result.addAll(compile(file));
} else {
if (!hasFiles) {
String path = file.getAbsolutePath();
String extension = path.substring(path.lastIndexOf(".") + 1);
if (extension.equals("java")) hasFiles = true;
}
}
}
if (hasFiles) result.add(directory.getAbsolutePath() + "/*.java");
return result;
};
}
At first I thought it cannot find the class, but when I removed the method.invoke statement, errors disappeared. Why does it happen and are there any workarounds?
Runtime.getRuntime().exec(command)
This is starting another process, so after this line is executed compilation is not yet finished, you need to wait for this process to end, and probably you should also handle output/error stream of process to check if it succeed or not.
Process compileProc = Runtime.getRuntime().exec(command);
compileProc.waitFor();
Also I don't know what are you trying to do, but remember that not everyone might have compiler available and configured java.hame property, or configured it to different java version. (like older one and your code will not compile or newer one and you code will not run)
The program opens a new thread to start the project, but it executes the next line without monitoring its completion, so the thread can be removed if it is not necessary. If necessary, you need to write a monitoring thread to monitor and schedule all threads so that it can continue to execute after it has finished its work. Tasks of the main thread.
I have a base and sub class. The requirement is to invoke sub class' method using reflection. Both programs are below.
base.java
import java.io.File;
import java.net.URL;
import java.net.URLClassLoader;
public class base {
public static void main(String[] args) {
URLClassLoader loader = null;
Class<?> cls;
try {
File file = new File("sub.jar" );
URL[] urls = { file.toURI().toURL() };
loader = new URLClassLoader(urls);
cls = loader.loadClass("sub");
base obj = (base) cls.newInstance();
obj.print();
}
catch(Exception e) {
System.out.println("Exception occured:" + e);
e.printStackTrace();
}
}
public void print() {
System.out.println("In Base class");
}
}
sub.java
public class sub extends base {
public void print() {
System.out.println("In subclass");
}
}
compile both in to jars.
javac base.java;
jar cvf base.jar base.class
javac sub.java;
jar cvf sub.jar sub.class
If I invoke the base.jar as "java -cp", it works fine
java -cp base.jar base
output: "In subclass"
But if I invoke it with "hadoop jar" command, I get
hadoop jar base.jar base
Exception in thread "main" java.lang.NoClassDefFoundError: base
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at base.main(base.java:15)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.hadoop.util.RunJar.run(RunJar.java:221)
at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
Caused by: java.lang.ClassNotFoundException: base
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
Any help is greatly appreciated.
I believe your issue is on line 15 where you try to case the loader as your base class. I believe the compiler doesn't know how to handle that. Additionally, I'm not sure why you're trying to run this program with Hadoop since it does not have any of the hadoop implementations or classes
The problem is solved by placing base.jar in hadoop classpath. Run "hadoop classpath" command which lists all classpath dirs. Place the jar in one of these directories.
I have a Java program based on ASM 5.0.2 to extract dependency between classes. The program works fine with an ordinary Java application. However, when I run the program as a plugin then it crashes with the bug: java.lang.ClassNotFoundException.
As an example if the example class uses junit.Assert, then when I run the project as an ordinary java application, it find this dependency, but when as plugin the below error:
java.lang.ClassNotFoundException: org.junit.Assert
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.net.FactoryURLClassLoader.loadClass(URLClassLoader.java:798)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:340)
Part of code that I think error is because of that is as below, and the whole code can be find in this link:
class ClassCollector extends Remapper {
static Set<Class<?>> getClassesUsedBy(final String name, final String prefix, File root) throws IOException {
final ClassReader reader = new ClassReader(name);
final Set<Class<?>> classes = new TreeSet<Class<?>> (new Comparator<Class<?>>() {
#Override
public int compare (final Class<?> o1, final Class<?> o2) {
return o1.getName().compareTo (o2.getName());
}
});
final Remapper remapper = new ClassCollector(classes, prefix, root);
final ClassWriter inner = new ClassWriter(ClassWriter.COMPUTE_MAXS);
final RemappingClassAdapter visitor = new RemappingClassAdapter(inner, remapper);
try {
reader.accept(visitor, ClassReader.EXPAND_FRAMES);
}
catch (Exception ex) {
ex.toString();
}
return classes;
}
Important: when I initialized inner (as below) with null, then the program does not crash, but cannot detect all dependencies, and for example cannot detect assert dependency in the above example.
final ClassVisitor inner = null; //new ClassWriter(ClassWriter.COMPUTE_MAXS);
Please let me know if any one knows why the program is correct as an ordinary java application, but crash as plugin.
ClassReader(String name) uses the ClassLoader.loadSystemResourceAsStream() method to access the bytes for a requested class. If the classes you want to analyze are not in the class path, this won't work, since the class path is what loadSystemResourceAsStream searches.
I am new to FreeTTS and this is my first program.The following program simply reads out a string passed.
I am using Linux Mint 32-bit if that matters.But I extracted jsapi.jar on my windows machine a day back.I believe it doesn't matter.
import javax.speech.*;
import java.util.*;
import javax.speech.synthesis.*;
public class Speak
{
String speaktext;
public void dospeak(String speak,String voicename)
{
speaktext=speak;
String voiceName =voicename;
try
{
SynthesizerModeDesc desc = new SynthesizerModeDesc(null,"general", Locale.US,null,null);
Synthesizer synthesizer = Central.createSynthesizer(desc);
synthesizer.allocate();
synthesizer.resume();
desc = (SynthesizerModeDesc) synthesizer.getEngineModeDesc();
Voice[] voices = desc.getVoices();
Voice voice = null;
for (int i = 0; i < voices.length; i++)
{
if (voices[i].getName().equals(voiceName))
{
voice = voices[i];
break;
}
}
synthesizer.getSynthesizerProperties().setVoice(voice);
System.out.print("Speaking : "+speaktext);
synthesizer.speakPlainText(speaktext, null);
synthesizer.waitEngineState(Synthesizer.QUEUE_EMPTY);
synthesizer.deallocate();
}
catch (Exception e)
{
String message = " missing speech.properties in " + System.getProperty("user.home") + "\n";
System.out.println(""+e);
System.out.println(message);
}
}
public static void main(String[] args)
{
Speak obj=new Speak();
obj.dospeak("Finally It speaks and speaks and speaks","kevin16");
}
}
I am getting this as a gift.
Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/speech/freetts/ValidationException
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:190)
at javax.speech.Central.registerEngineCentral(Central.java:703)
at javax.speech.Central.loadProps(Central.java:775)
at javax.speech.Central.availableSynthesizers(Central.java:651)
at javax.speech.Central.createSynthesizer(Central.java:553)
at Speak.dospeak(Speak.java:16)
at Speak.main(Speak.java:47)
Caused by: java.lang.ClassNotFoundException: com.sun.speech.freetts.ValidationException
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 8 more
What can I do not to accept this gift.
PS
I have added all the 4 archives viz en_us.jar,freetts-jsapi10.jar, jsapi.jar,mbrola.jar
1) Find in which jar this class is usually defined:
com.sun.speech.freetts.ValidationException
2) See if you have the jar
3) See if you have the right version of this jar
(open it, see if the class file is there)
4) See if the jar is in the classpath at runtime
I am following the example listed in this link to add custom email notifications.
In my maven project 'RegistryService': I created the EmailTransformHandler and used maven to create the RegistryService-0.1.jar. I also modified the GREG_HOME/repository/conf/axis2/axis2.xml by adding the handler:
<handler name="EmailTransformHandler"
class="com.registration.example.service.EmailTransformHandler"/>
and dropped the RegistryService-0.1.jar in GREG_HOME/repository/components/dropins
package com.registration.example.service;
import java.util.ArrayList;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.xpath.AXIOMXPath;
import org.apache.axiom.soap.SOAPEnvelope;
import org.apache.axis2.AxisFault;
import org.apache.axis2.context.MessageContext;
import org.apache.axis2.engine.Handler;
import org.apache.axis2.handlers.AbstractHandler;
public class EmailTransformHandler extends AbstractHandler implements Handler {
private String name;
public String getName() {
return name;
}
#Override
public InvocationResponse invoke(MessageContext msgContext) throws AxisFault {
if (msgContext.getTo() != null && msgContext.getTo().getAddress().startsWith("mailto:")) {
try {
SOAPEnvelope env = msgContext.getEnvelope();
AXIOMXPath xPath = new AXIOMXPath("//ns:text");
xPath.addNamespace("ns", "registry_example");
OMElement element = (OMElement) ((ArrayList) xPath.evaluate(env)).get(0);
element.setText(element.getText().replace("--", "This message intercepted by Terminator"));
} catch (Exception e) {
e.printStackTrace();
}
}
return InvocationResponse.CONTINUE;
}
}
When I go to the GREG_HOME/bin and start the server I get following exception:
2013-02-08 12:05:00,952] FATAL {org.wso2.carbon.core.init.CarbonServerManager} - WSO2 Carbon initialization Failed
org.apache.axis2.AxisFault: Exception occured while loading the Axis configuration from GREG_HOME/wso2/wso2greg-4.5.3/repository/conf/axis2/axis2.xml
at org.wso2.carbon.core.CarbonAxisConfigurator.getAxisConfiguration(CarbonAxisConfigurator.java:190)
at org.apache.axis2.context.ConfigurationContextFactory.createConfigurationContext(ConfigurationContextFactory.java:64)
at org.wso2.carbon.core.CarbonConfigurationContextFactory.createNewConfigurationContext(CarbonConfigurationContextFactory.java:65)
at org.wso2.carbon.core.init.CarbonServerManager.initializeCarbon(CarbonServerManager.java:398)
at org.wso2.carbon.core.init.CarbonServerManager.removePendingItem(CarbonServerManager.java:290)
at org.wso2.carbon.core.init.PreAxis2ConfigItemListener.bundleChanged(PreAxis2ConfigItemListener.java:118)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.dispatchEvent(BundleContextImpl.java:847)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:340)
Caused by: org.apache.axis2.deployment.DeploymentException: com.registration.example.service.EmailTransformHandler
at org.apache.axis2.deployment.util.Utils.loadHandler(Utils.java:149)
at org.apache.axis2.deployment.AxisConfigBuilder.processPhaseList(AxisConfigBuilder.java:549)
at org.apache.axis2.deployment.AxisConfigBuilder.processPhaseOrders(AxisConfigBuilder.java:584)
at org.apache.axis2.deployment.AxisConfigBuilder.populateConfig(AxisConfigBuilder.java:150)
at org.wso2.carbon.core.CarbonAxisConfigurator.populateAxisConfiguration(CarbonAxisConfigurator.java:308)
at org.wso2.carbon.core.CarbonAxisConfigurator.getAxisConfiguration(CarbonAxisConfigurator.java:188)
... 8 more
Caused by: java.lang.ClassNotFoundException: com.registration.example.service.EmailTransformHandler
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:513)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:429)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:417)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at org.apache.axis2.util.Loader.loadClass(Loader.java:261)
at org.apache.axis2.util.Loader.loadClass(Loader.java:229)
at org.apache.axis2.deployment.util.Utils.loadHandler(Utils.java:116)
... 13 more
What configuration am I missing? Googling about this error does not yield any relevant results( except some Russian forums which do not help me much). I even tried adding the jar via WSO2 Management Console as an extension, but I still get this exception.
According to the error, your RegistryService-0.1.jar is not set properly to the class path.
If the jar file is not an OSGI bundle that jar file should be drop in to the "GREG_HOME/repository/components/lib" directory.
-Ajith