Lets say i have a class file A.class and i keep it inside some package of an already exisiting web project in deployed in glassfish server in linux. A.class has many dependent with many other classes in same package or other package of the same web project.
Now i cd into the folder and try to run java A it throws following exception Exception in thread "main" java.lang.NoClassDefFoundError /path/A.Is it because the class file coulnot find its dependencies?. Is there any way to make it run.
Error log. Here the class file i want to run is ChangeBulkPassword
Exception in thread "main" java.lang.NoClassDefFoundError: com/project_name/ChangeBulkPassword
Caused by: java.lang.ClassNotFoundException: com.project_name.ChangeBulkPassword
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: com.project_name.ChangeBulkPassword. Program will exit.
Edit:
I cd to project_name\WEB-INF\classes and then run java packagename.ChangeBulkPassword.It throws exception that i cannot find required library.Is there a way to reference those libraries?
If your A.class has a package name com.xxx.yyy there must be a directory tree com/xxx/yyy,you should cd to the directory where com directory exists and then run the class by type java com.xxx.yyy.A.
EDIT:
If there is a directory tree:
/home/me/webapps/com/project_name/ChangeBulkPassword
cd
cd webapps
java -classpath "." com.project_name.ChangeBulkPassword
Related
I am trying to run a code with multiple Java class files and a jar file which is from a library I downloaded. I compiled them with the following:
javac -cp "quickfixj-all-.jar" BTCCMarketDataRequest.java Bot.java
The Bot class has the main method and the BTCCMarketDataRequest file has a bunch of other methods in the class. I am not creating any packages.
How should I run it though?
If I do:
java Bot
I get the following output:
Exception in thread "main" java.lang.NoClassDefFoundError: quickfix/Group
at Bot.main(Bot.java:4)
Caused by: java.lang.ClassNotFoundException: quickfix.Group
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
... 1 more
The compiled class (the one in the jar file could not be found, but why? I compiled it.
I am new to Java so I have no idea what's going on.
Thank you!
You need to add the classpath while executing the program as well.
java -cp .:quickfixj-all-.jar Bot
This assumes that the Bot class is in the default package and all the jar and .class dependencies are in the same directory.
I built a java program in Eclipse in Windows and it worked well. The program included 5 java classes and 5 jar library files.
Then I copied all *.java files and *.jar files to Linux. After I compiled and run it, I got an exception, the class PaserException of htmlparser.jar was not found.
Exception in thread "main" java.lang.NoClassDefFoundError: org/htmlparser/util/ParserException
Caused by: java.lang.ClassNotFoundException: org.htmlparser.util.ParserException
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
I just begin to learn Linux so I'm not sure if I compiled and run it correctly.
All of my files(*.java and *.jar) are in the same directory, and my operation is in this directory.
To compile:
javac -cp ./htmlparser.jar:./filterbuilder.jar:./sitecapturer.jar:./thumbelina.jar:./htmllexer.jar *.java
To run:(the main method is in Crawler class, main method requires at lease 1 argument)
java -cp ./htmlparser.jar:./filterbuilder.jar:./sitecapturer.jar:./thumbelina.jar:./htmllexer.jar Crawler arg0 arg1
Then I got the exception above. Did I compile and run it correctly? Why did I got this exception? Thanks.
The folder that holds the class file (.) is not on the classpath. Add another :. to the classpath:
java -cp ./htmlparser.jar:./filterbuilder.jar:./sitecapturer.jar:./thumbelina.jar:./htmllexer.jar:. Crawler arg0 arg1
I have tried several approaches as suggested on this website as well as several others to no avail.
-Running Angstrom embedded Linux, OpenJDK6, Shark VM.
File Structure
All .java and .jar files are stored in directory ./src
jarfiles: j1.jar j2.jar
Source code: Coder.java, WrapperClass.java
Compiling and Running
javac -cp j1.jar:j2.jar Coder.java WrapperClass.java
Successfully compiles, outputs Coder.class, WrapperClass.class, as well as several other files including Coder$1.class through Coder$6.class, as well as Coder$Main_thread.class and Coder$Progress_Bar_Thread.class, any insight onto what all these .class files are for?
Run attempts all terminate in java.lang.ClassNotFoundException.
~/coder/src: java Package.Coder
~/coder/src: java -cp jar1.jar:jar2.jar Package.Coder
~/coder: java ./src/Package.Coder
~/coder: java -cp jar1.jar:jar2.jar ./src/Package.Coder
Thank you very much for your help. I have run this on NetBeans and can verify that it's functional code, just a matter of getting it to run on Linux.
Stacktrace is:
Exception in thread "main" java.lang.NoClassDefFoundError: Package/Coder Caused by: java.lang.ClassNotFoundException: Package.Coder
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:334)
Could not find the main class: Package.Coder. Program will exit
Assuming this structure
/coder
/src
/Package
/Coder.java
/WrapperClass.java
/j1.jar
/j2.jar
You will need to compile from /src as
javac -cp j1.jar:j2.jar Package/Coder.java Package/WrapperClass.java
This will create .class files in /Package. You can then run it, again from /src as
java -cp j1.jar:j2.jar Package.Coder
assuming the Coder class has a main method which is your entry point.
The file FactoryDemo.java is compiled successfully and in it there is the
package home.city.Desktop.factorydemo;
I compile it by using javac -d / FactoryDemo.java and nothing wrong is reported.
But when I try to run it by using java home.city.Desktop.factorydemo.FactoryDemo, it reports：
Exception in thread "main" java.lang.NoClassDefFoundError: home/city/Desktop/factorydemo/FactoryDemo
Caused by: java.lang.ClassNotFoundException: home.city.Desktop.factorydemo.FactoryDemo
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: home.city.Desktop.factorydemo.FactoryDemo. Program will exit.
I have tried many times but I could not find the solution to the problem. Thanks for your help in advance.
Your compiled class must be in a directory called:
home/city/Desktop/factorydemo
On Unix, just run this:
mkdir -p home/city/Desktop/factorydemo; mv FactoryDemo.class home/city/Desktop/factorydemo/
For best practice, simply move your Java source file in that folder too so the compiler outputs the file to the right spot.
FactoryDemo Class is created under root directory, you should type following command ( . instead of /)
javac -d . FactoryDemo.java
It creates home.city.Desktop.factorydemo directories starting from current directory.
If you want class created under root directory. You must type following command to execute.
java -classpath / home.city.Desktop.factorydemo.FactoryDemo
java.lang.NoClassDefFoundError
I have a java program which is dependant on two jar files.
i compile the program using command :
javac -classpath jar1.jar:jar2.jar myprog.java and it compiles successfully.
But when i try to run the program using command : java -cp jar1.jar:jar2.jar myprog , it is throwing the java.lang.NoClassDefFoundError . please help , where am i wrong ?
i am using ubuntu 10.04.
Actual error :
Exception in thread "main" java.lang.NoClassDefFoundError: userapps/SelectionTask_classes/SelectionTask
Caused by: java.lang.ClassNotFoundException: userapps.SelectionTask_classes.SelectionTask
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: userapps/SelectionTask_classes/SelectionTask. Program will exit.
where SelectionTask is my class file generated after successful compilation.
Make sure that the current directory is also in the classpath. Try running with:
java -cp .:jar1.jar:jar2.jar myprog
if your compiled class file myprog.class is in the current directory.
(This assumes that your program is not in a package).
You need to add directory where your compiled java program (*.class) file is located. If it's in current directory then you could run it like this (notice "." which denotes current working directory):
java -cp .:jar1.jar:jar2.jar myprog
Look at the error, it's complaining about not being able to find "userapps.SelectionTask_classes.SelectionTask", which hints at the last entry in your classpath not beign specified correctly. Now, assuming that the JAR files you have specified are in the following directory structure:
./hadoop-0.20.1-core.jar
./lib/hadoopdb.jar
./userapps/SelectionTask_classes/
You would run:
java -cp hadoop-0.20.1-core.jar:lib/hadoopdb.jar:userapps/SelectionTask_classes/ myprog