I am trying to run a very simple JFace program:
import org.eclipse.jface.window.*;
import org.eclipse.swt.*;
import org.eclipse.swt.widgets.*;
public class HelloSWT_JFace extends ApplicationWindow{
public HelloSWT_JFace(){
super(null);
}
protected Control createContents(Composite parent){
Text helloText = new Text(parent, SWT.CENTER);
helloText.setText("Hello SWT and JFace");
parent.pack();
return parent;
}
public static void main(String[] args) {
HelloSWT_JFace awin = new HelloSWT_JFace();
awin.setBlockOnOpen(true);
awin.open();
Display.getCurrent().dispose();
}
}
As far as I know, all the libraries are installed and the code, in Eclipse, gives me no errors. Nonetheless, when I run I get
and the long error report:
Exception in thread "main" java.lang.NoClassDefFoundError: org/eclipse/core/runtime/IProgressMonitor
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
at java.lang.Class.getMethod0(Unknown Source)
at java.lang.Class.getMethod(Unknown Source)
at sun.launcher.LauncherHelper.getMainMethod(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.eclipse.core.runtime.IProgressMonitor
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 6 more
Does anyone know what could be causing this?
Please note; I took a look at THIS question and followed the solutions, but installing Equinox plugins did not work.
Thanks to the links Baz provided, I found the solution by making sure all the necessary Jars were added (I was missing a couple).
The necessary jars are:
org.eclipse.core.commands_<version info>.jar
org.eclipse.equinox.common_<version info>.jar
org.eclipse.jface_<version info>.jar
org.eclipse.osgi_<version info>.jar
org.eclipse.ui.workbench_<version info>.jar
More info can be found at the link Baz provided: "Identify the Required External JAR Files for SWT and JFace"
Related
While learning and exploring Java 9 from eclipse. I create a simple project in eclipse, Although when I compile the project, it prints the program's expected result but along following exception too.
Could not instrument class mymodule/App: java.lang.IllegalArgumentException
at org.eclipse.jdt.launching.internal.org.objectweb.asm.ClassReader.<init>(Unknown Source)
at org.eclipse.jdt.launching.internal.weaving.ClassfileTransformer.transform(ClassfileTransformer.java:25)
at org.eclipse.jdt.launching.internal.javaagent.Premain$1.transform(Premain.java:51)
at java.instrument/java.lang.instrument.ClassFileTransformer.transform(Unknown Source)
at java.instrument/sun.instrument.TransformerManager.transform(Unknown Source)
at java.instrument/sun.instrument.InstrumentationImpl.transform(Unknown Source)
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(Unknown Source)
at java.base/java.security.SecureClassLoader.defineClass(Unknown Source)
at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(Unknown Source)
at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(Unknown Source)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(Unknown Source)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(Unknown Source)
at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Unknown Source)
at java.base/sun.launcher.LauncherHelper.loadMainClass(Unknown Source)
at java.base/sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Java code:
package mymodule;
import java.util.List;
public class App {
public static void main(String[] args) {
List<String> immutables = List.of("Food", "Water", "House");
System.out.println(immutables.get(0));
}
}
module-info.java file
module mymodule {
}
Seems like Eclipse is yet to migrate to ASM_6.0 which is completely Java 9 compatible.
On the other hand you're looking at the stacktrace which is similar to BUG#526383 and you can follow the same for updates.
I am very new to boilerpipe and I am trying out the following basic code:
package contentExtraction;
import java.net.URL;
import de.l3s.boilerpipe.extractors.ArticleExtractor;
public class ContentExtractor {
public static void main(String[] args) throws Exception {
final URL url = new URL(
// "http://www.l3s.de/web/page11g.do?sp=page11g&link=ln104g&stu1g.LanguageISOCtxParam=en"
"http://www.dn.se/nyheter/vetenskap/annu-godare-choklad-med-hjalp-av-dna-teknik"
);
System.out.println(ArticleExtractor.INSTANCE.getText(url));
}
}
But I am getting the following error when trying to run the above piece of code:
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/xerces/parsers/AbstractSAXParser
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at de.l3s.boilerpipe.sax.BoilerpipeSAXInput.getTextDocument(BoilerpipeSAXInput.java:51)
at de.l3s.boilerpipe.extractors.ExtractorBase.getText(ExtractorBase.java:69)
at de.l3s.boilerpipe.extractors.ExtractorBase.getText(ExtractorBase.java:87)
at contentExtraction.ContentExtractor.main(ContentExtractor.java:16)
Caused by: java.lang.ClassNotFoundException: org.apache.xerces.parsers.AbstractSAXParser
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 16 more
I googled the error and came across this link. I thought that I was missing xercesImpl.jar in my dependencies. I included the same, still my code is giving the same error. What is the issue?
I figured the solution myself. The boilerpipe jar has further dependencies. I converted my project to maven project, included the dependency:
<dependency>
<groupId>com.syncthemall</groupId>
<artifactId>boilerpipe</artifactId>
<version>1.2.1</version>
</dependency>
When I build the above project, I can see there are actually 4 jars that are imported in Maven Dependencies folder:
boilerpipe-1.2.1.jar
nekohtml-1.9.18.jar
xercesImpl-2.11.0.jar
xml-apis-1.4.01.jar
I have a Dynamic Web Project in Java and I use Jena and D2RQ libraries.
When I start my project as "Java Application", I have this problem:
Exception in thread "main"
java.lang.IncompatibleClassChangeError: Implementing class at
java.lang.ClassLoader.defineClass1(Native Method) at
java.lang.ClassLoader.defineClass(Unknown Source) at
java.security.SecureClassLoader.defineClass(Unknown Source) at
java.net.URLClassLoader.defineClass(Unknown Source) at
java.net.URLClassLoader.access$100(Unknown Source) at
java.net.URLClassLoader$1.run(Unknown Source) at
java.net.URLClassLoader$1.run(Unknown Source) at
java.security.AccessController.doPrivileged(Native Method) at
java.net.URLClassLoader.findClass(Unknown Source) at
java.lang.ClassLoader.loadClass(Unknown Source) at
sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at
java.lang.ClassLoader.loadClass(Unknown Source) at
de.fuberlin.wiwiss.d2rq.algebra.CompatibleRelationGroup.addNodeRelation(CompatibleRelationGroup.java:53)
at
de.fuberlin.wiwiss.d2rq.algebra.CompatibleRelationGroup.groupNodeRelations(CompatibleRelationGroup.java:38)
at de.fuberlin.wiwiss.d2rq.find.FindQuery.iterator(FindQuery.java:78)
at
de.fuberlin.wiwiss.d2rq.jena.GraphD2RQ.graphBaseFind(GraphD2RQ.java:88)
at com.hp.hpl.jena.graph.impl.GraphBase.find(GraphBase.java:240) at
com.hp.hpl.jena.graph.compose.DisjointUnion.graphBaseFind(DisjointUnion.java:27)
at com.hp.hpl.jena.graph.impl.GraphBase.find(GraphBase.java:240) at
com.hp.hpl.jena.graph.impl.GraphBase.graphBaseFind(GraphBase.java:260)
at com.hp.hpl.jena.graph.impl.GraphBase.find(GraphBase.java:257) at
com.hp.hpl.jena.graph.query.SimpleQueryHandler.predicatesFor(SimpleQueryHandler.java:68)
at
com.hp.hpl.jena.graph.query.SimpleQueryHandler.predicatesFor(SimpleQueryHandler.java:47)
at
com.hp.hpl.jena.rdf.model.impl.ModelCom.listPredicates(ModelCom.java:751)
at
com.hp.hpl.jena.rdf.model.impl.ModelCom.listNameSpaces(ModelCom.java:763)
at
com.hp.hpl.jena.xmloutput.impl.BaseXMLWriter.addNameSpaces(BaseXMLWriter.java:233)
at
com.hp.hpl.jena.xmloutput.impl.BaseXMLWriter.setupNamespaces(BaseXMLWriter.java:487)
at
com.hp.hpl.jena.xmloutput.impl.BaseXMLWriter.write(BaseXMLWriter.java:469)
at MyPackage.MyClass.Mymethod(MyClass.java:118) at
MyPackage.Test.main(Test.java:77)
The row 118 of the class "MyClass" contains this code:
writer.write(d2rqModel, new OutputStreamWriter(out, "utf-8"),loader.getResourceBaseURI());
with
RDFWriter writer;
and
import com.hp.hpl.jena.rdf.model.RDFWriter;
Why I have this problem?
In addition, the same class in a different project works well!!! Why?
You've changed and recompiled the class without recompiling everything that depends on it. Do a clean build. You may get some compiler errors in the process.
You may have added dependency that are ambiguous to compiler's understanding. Verify that you don't have duplicate dependency for same class.
I am currently trying to build a simple java Game with Slick and Maven.
My Setup does work basicly. But when I extend my Main Class to be a Slick "BasicGame" I can't execute the jar anymore, promting this error message:
D:\workspace\GameTest\target>java -jar GameTest-1.0-SNAPSHOT.jar
Exception in thread "main" java.lang.NoClassDefFoundError: org/newdawn/slick/BasicGame
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.newdawn.slick.BasicGame
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 12 more
Could not find the main class: gameTest.MyGame. Program will exit.
Before I did this everything executed just fine. The Pom.xml is copied from here.
the MyGame class looks like this:
...
imports
...
public class MyGame extends BasicGame {
...
empty implementations of BasicGame Methods
...
public static void main(String[] args){
System.out.println("Hello World");
}
}
Does anyone know why this error occures?
Does anyone know why this error occurs?
When you switched to using an executable jar, you created a situation where your dependent library - slick.jar - is no longer in your class path. Everything starts out OK because MyGame is in your jar file. But MyGame extends BasicGame which is not in your jar file. It is in slick.jar and your java command makes no reference to slick.jar.
Somehow you have to get all your dependencies back into your class path. For more information check out related question Is it possible to create an "uber" jar containing the project classes and the project dependencies as jars with a custom manifest file?
Just checked your pom.xml file - you'll have to integrate lwjgl and vecmath into your class path also.
I want to encrypt a string, but the standard Java libraries are too complicated for me.
So I turned to Jasypt labriry. It's pretty simple to use and understan. However when I import the library to Eclipse 3.6 and when I try encrypt a string like "Hello" with the password "123", it always comes up with an error. I'm not sure what I'mm doing wrong but I think it also happens when I use other libraries in Eclipse.
Source:
import org.jasypt.util.text.BasicTextEncryptor;
public class Main {
static BasicTextEncryptor textEncryptor = new BasicTextEncryptor();
public static void main(String[] args) {
System.out.println("Hello World");
textEncryptor.setPassword("123");
System.out.println(textEncryptor.encrypt("Hello World"));
}
}
The error message:
java.lang.NoClassDefFoundError: org/apache/commons/lang/exception/NestableRuntimeException
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.jasypt.util.text.BasicTextEncryptor.<init>(BasicTextEncryptor.java:67)
at eMain.<clinit>(eMain.java:4)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.lang.exception.NestableRuntimeException
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 14 more
The library you imported depends on another library containing org/apache/commons/lang/exception/NestableRuntimeException. This is located in the Apache Commons Lang library.
In fact, if you downloaded JASYPT from http://sourceforge.net/projects/jasypt/files/ you'll get a zip file containing a lib-folder with these files:
commons-codec-1.1.jar
commons-lang-2.1.jar
jasypt-1.6.jar
You should include all of these in your project.
I tried it and your little sample program works fine (and prints the following)
Hello World
v09l9j/BIeSoMkQXc2CY0VIJLlLAQTYq