I have the following directory structure:
somedir/
lib/
myapp.jar
commons-io-2.1.jar
...lots of otherjars
From inside somedir, I try to run the following command:
java -cp lib/* net.myapp.Driver /home/myUser.blah.text
And I am getting the following exception:
Exception in thread "main" java.lang.NoClassDefFoundError: lib/commons-io-2/1/jar
Caused by: java.lang.ClassNotFoundException: lib.commons-io-2.1.jar
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: lib/commons-io-2.1.jar. Program will exit.
Why is it telling me that it can't find a "main" in Apache Commons IO? I might be able to understand if it couldn't find my Driver class (maybe I misconfigured something), but this is just throwing me way off. Ideas? Thanks in advance!
From the stack trace it appears as if java is taking the commons-io Jar for a class which leads me to a wild guess: Could it be a whitespace problem? Is it possible that lib contains a jar with a space in it? Have you tried enclosing the cp option in quotes (i.e. use -cp "lib/*")?
Use quotes.
java -cp "lib/*" net.myapp.Driver /home/myUser.blah.text
Well explained here.
you could also try java -cp /lib/* net.myapp.Driver /home/myUser.blah.text
Related
Note
I'm running windows, the path just looks like it's linus because I typed it manually and thats how I think of paths.
I'm trying to run a java class That I have built to diagnose my connection to a databse, it references the oracle jdbc adaptor.
When I just run it without a class path:
%> java DBDiagnostics <connectionString>
I get an exception when it reaches the following line of code:
Class.forName("oracle.jdbc.pool.OracleDataSource").newInstance();
with the following exception:
java.lang.ClassNotFoundException: oracle.jdbc.pool.OracleDataSource
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at DBDiagnostics.GetConnection(DBDiagnostics.java:43)
at DBDiagnostics.runDiagnostic(DBDiagnostics.java:29)
at DBDiagnostics.main(DBDiagnostics.java:18)
Creating connection.
java.sql.SQLException: No suitable driver found for lskd
at java.sql.DriverManager.getConnection(DriverManager.java:602)
at java.sql.DriverManager.getConnection(DriverManager.java:207)
at DBDiagnostics.GetConnection(DBDiagnostics.java:55)
at DBDiagnostics.runDiagnostic(DBDiagnostics.java:29)
at DBDiagnostics.main(DBDiagnostics.java:18)
Veryfying connectivity to Database
Exception in thread "main" java.lang.NullPointerException
at DBDiagnostics.verifyTable(DBDiagnostics.java:86)
at DBDiagnostics.verifyTable(DBDiagnostics.java:76)
at DBDiagnostics.verifyDatabseConnectivity(DBDiagnostics.java:68)
at DBDiagnostics.runDiagnostic(DBDiagnostics.java:36)
at DBDiagnostics.main(DBDiagnostics.java:18)
I assume that this is because I need to include it in the classpath.
So, I tried adding it to the classpath like this:
%> java -classpath .:ojdbc6.jar DBDiagnostics <connectionString>
The VM just says it cant find the class:
Exception in thread "main" java.lang.NoClassDefFoundError: DBDiagnostics
Caused by: java.lang.ClassNotFoundException: DBDiagnostics
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
Could not find the main class: DBDiagnostics. Program will exit.
I know this is a question I should just know the answer to, but what am I doing wrong?
Replace the colon with a semicolon:
java -classpath .;ojdbc6.jar DBDiagnostics <connectionString>
is there a typo:
%> java -classpath .:ojdbc6.jar DBDiagnostics <connectionString>
maybe it would work if you type this:
%> java -classpath ./ojdbc6.jar DBDiagnostics <connectionString>
Does the DBDiagnostics.class file appear in the directory from which you're launching Java? If not, the class loader won't find it.
Does the DBDiagnostics class have a package? If it does, you have to refer to the fully resolved class name, and the root of the package hierarchy has to appear in the directory from which you launch Java.
Mike Sickler's answer looks right for a Windows platform. The path separator for Windows is ";", but ":" for Unix and Linux, so make sure you always use the right one!
Long shot, but is this Unix or Windows? If on Windows the class path separator should be a semi colon:-
%> java -classpath .;ojdbc6.jar DBDiagnostics <connectionString>
And of course you need to have the ojdbc6.jar file in the current directory if you don't specify any path to it. (And possibly it's dependencies as well...)
I am having trouble on setting up classpath on Mac. The following is the code I have attempted,
First I exported the jars using terminal
abc-MacBook-Pro:~ abc$ export
CLASSPATH=$CLASSPATH:/Users/abc/Desktop/IR/luceneJar/demo/lucene-demo-4.0.0.jar: export
CLASSPATH=$CLASSPATH:/Users/abc/Desktop/IR/luceneJar/core/lucene-core-4.0.0.jar: export
CLASSPATH=$CLASSPATH:/Users/abc/Desktop/IR/luceneJar/queryparser/lucene-queryparser-4.0.0.jar: export
CLASSPATH=$CLASSPATH:/Users/abc/Desktop/IR/luceneJar/analysis/common/lucene-analyzers-common-4.0.0.jar
Then when I echoed the classpath, following is the result
abc-MacBook-Pro:~ abc$ echo $CLASSPATH
/Users/abc/Desktop/IR/lucene-4.0.0 2/core/lucene-core 4.0.0.jar:
/Users/abc/Desktop/IR/lucene-4.0.0 2/demo/lucene-demo-4.0.0.jar:
/Users/abc/Desktop/IR/luceneJar/analysis/common/lucene-analyzers-common-4.0.0.jar
The error I am having is following when I tried to function the index file
abc-MacBook-Pro:~ abc$ java org.apache.lucene.demo.IndexFiles -docs
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/lucene/demo/IndexFiles
Caused by: java.lang.ClassNotFoundException: org.apache.lucene.demo.IndexFiles
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Please let me know about the above error, thank you in advance. I am quite new with Lucene Java.
This is common Java classpath problem, nothing related to lucene (or mac) here.
Try this
1) Create lib folder and move all your lucene jars to lib
- lets say your project has two folders now lib and src, lib has all jars and src has yourJavaFile.java
2) Run below commands for compilation and execution from your src
- javac -cp ".:../lib/*" yourJavaFile.java
- java -cp ".:../lib/*" yourJavaFile
I'm trying to start local version of DynamoDB on the command line (OSX) using the following command as specified in the documentation:
java –Djava.library.path=. -jar DynamoDBLocal.jar
But getting the following errors:
Exception in thread "main" java.lang.NoClassDefFoundError: �Djava/library/path=/
Caused by: java.lang.ClassNotFoundException: �Djava.library.path=.
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Any ideas on how to resolve this issue?
The � shows that it may be a character, which looks like hyphen '-' . Please inspect this.
Also, whenever you are using -D option, its best practice to use a complete jar name (rather than wild card). This will make sure that you are missing nothing.
I am unable to resolve this issue in which i was trying to executing a java program through bash script .
Why i am getting this error ??
Exception in thread "main" java.lang.NoClassDefFoundError: com/QuoteTester
Caused by: java.lang.ClassNotFoundException: com.QuoteTester
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: com.QuoteTester. Program will exit.
This is my script content quotetest.sh
java -cp ./com/ug_ugbapi-all.jar com.QuoteTester $1
I am executing the script , this way
./quotetest.sh GOOG
From the directory from where i am executing this script quotetest.sh , in that i got a directory by name com under which i got ug_ugbapi-all.jar and QuoteTester.class classes .
Tried every option (placing all the files in same folder com , but nothing worked )
Could anybody please tell me how to resolve it ??
With your given classpath, Java is only going to look in the jar file. For it to find the class file outside of the jar, you have to modify your -cp argument:
java -cp ./com/ug_ugbapi-all.jar:. com.QuoteTester $1
You are getting this error because the com/QuoteTester class cannot be found, which means that the com/QuoteTester class is not on the classpath.
I seem to be unable to compile a simple MongoDB + Java Example:
I have this file
https://github.com/mongodb/mongo-java-driver/blob/master/examples/QuickTour.java
In my command line I compile by doing
$ javac -cp mongo-2.10.1.jar QuickTour.java
$ java -cp mongo-2.10.1.jar QuickTour
However it gives me the error
Exception in thread "main" java.lang.NoClassDefFoundError: QuickTour
Caused by: java.lang.ClassNotFoundException: QuickTour
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
What is going on and how can I fix this? Is it something to do with my compilation arguments?
Thanks...
It's not the compile time error. It's the error you got when you try to run your class. And the error simply says that it cannot find the class that you are trying to run. That error almost always means that you messed up with the classpath.
The problem is, you forgot to include the current directory in your argument to classpath. Add a dot(.) in addition to your mongo.jar file as the argument to -cp:
java -cp .;mongo-2.10.1.jar QuickTour
This assuming that you are executing your QuickTour class from the same directory where you have placed it.