Develop Reference

Jdbc no suitable driver found. Postgresql [duplicate]

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...)

ClassNotFoundException in RMI + servlet [duplicate]

This question already has answers here:
java.rmi.ServerException: RemoteException occurred in server thread (ClassNotFoundException)
(5 answers)
Closed 6 years ago.
Hi I'm trying to run a java application that binds a class to the naming server, but i constantly get a ClassNotFoundException
First I start the registry:
rmiregistry
then from eclipse I try to execute the server but get this error
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: progInternet2008.commons.NominabileFactory
at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:396)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:250)
at sun.rmi.transport.Transport$1.run(Transport.java:159)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:255)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:233)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:359)
at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
at progInternet2008.Pozzobon.tesi.Slave.main(Slave.java:54)
Caused by: java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: progInternet2008.commons.NominabileFactory
at sun.rmi.registry.RegistryImpl_Skel.dispatch(Unknown Source)
at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:386)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:250)
at sun.rmi.transport.Transport$1.run(Transport.java:159)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassNotFoundException: progInternet2008.commons.NominabileFactory
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 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:247)
at sun.rmi.server.LoaderHandler.loadProxyInterfaces(LoaderHandler.java:711)
at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:655)
at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:592)
at java.rmi.server.RMIClassLoader$2.loadProxyClass(RMIClassLoader.java:628)
at java.rmi.server.RMIClassLoader.loadProxyClass(RMIClassLoader.java:294)
at sun.rmi.server.MarshalInputStream.resolveProxyClass(MarshalInputStream.java:238)
at java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1531)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1493)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
... 12 more
I've read the RMI Java tutorial but still could not get it working...
As VM Arguments I've set this:
-Djava.rmi.server.codebase=file:${workspace_loc}/progInternet2008
please help me
(I'm using Java 6)

Run the rmiregisrty command from your /bin, /build, or /build/classes folder, whichever folder is the root of your built files.
I spent half a day trying to solve that same thing.

The exception is occurring because the rmiregistry application doesn't know where to load classes from. When you attempt to bind an object in the RMI registry, the registry downloads the class definition for that object. Some of the other answers are telling you to get around this by setting the classpath for the rmiregistry app so that it has the class definitions when it is started and doesn't need to download anything, but Sun's Java RMI tutorial explicitly says not to do this. I suspect this has the potential to cause conflicts between the version of the class in the registry and the class on the server.
The correct way to handle the problem is to set the java.rmi.server.codebase property as you were trying to do. The property requires that a directory path be terminated with a forward slash, like so:
-Djava.rmi.server.codebase=file:${workspace_loc}/progInternet2008/
You may also be having trouble if the ${workspace_loc} variable is a relative path and the rmiregistry application was not started in the same directory so the relative path is not correct for it. If you either make the path absolute, or start the rmiregistry in the appropriate directory, the ClassNotFoundException should go away. See the tutorial on the java.rmi.server.codebase property for a little more detailed information.

Okay I just overcame this problem. Make sure when you run rmiregistry that your CLASSPATH environment variable is set.
For example, you might have a script:
set CLASSPATH=[path to jdbc driver].jar
rmiregistry.exe
This was all I needed to get my lost classpath working. I'm not sure how to send -cp commandline to rmiregistry.exe. Its documentation is quite lacking.

I'm fairly certain that you'll have to start your RMI server using the same classpath as your application. I believe it takes the same parameters as java, i.e. -cp [your class path].

Close the cmd window where the rmiregistry was initially started.In a fresh cmd go to the location where your project classfiles are located(uptill bin) and start the registry using the below command:
rmiregistry -J-Djava.rmi.server.useCodebaseOnly=false
If you are using Eclipse ,Run the ServerSideProject and your ImplementationClass Instance gets bound to the URL specified.
Just print a line below the the binding method and see to it whether it is gets printed. If it gets printed successfully it means your server is working fine.

try to add /bin at the end of your VM Arg:
-Djava.rmi.server.codebase=file:${workspace_loc}/progInternet2008/bin
The file you will run are in this directory, so you need to include it in the path.

I upgraded from JDK1.6.0_33 to 1.7.0_45 and had the same problem. I found this document and resolved the problem by starting rmiregistry with:
rmiregistry -Djava.rmi.server.useCodebaseOnly=false
Refer below
http://docs.oracle.com/javase/7/docs/technotes/guides/rmi/enhancements-7.html

I had the same problem, to fix this ensure that your CLASSPATH is set to the path containing the server classes when running rmiregistry.
On a linux machine run the following commands.
export CLASSPATH="<server_class_path>"
Ensure the CLASSPATH has been set:
echo $CLASSPATH
Once the class path has been set, run rmiregistry
rmiregistry &

I spent a whole day uninstalling and reinstalling my JDK and changing the classpaths's and environment variables. But the culprit was that the command start rmigregistry didnt' start rmiregistry in a proper way. So, thanks for the comments on this page the solution was to unset the CLASSPATH temporarily. And that is done through the command set CLASSPATH=

What this following error means?

I am running my java program but on executing it gives me following error.
before it was running fine but now it's throwing following error.
I checked my class path, path in environment variable all are correct.
Exception in thread "main" java.lang.UnsatisfiedLinkError: java.util.zip.ZipFile
.open(Ljava/lang/String;IJ)J
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:114)
at java.util.jar.JarFile.<init>(JarFile.java:135)
at java.util.jar.JarFile.<init>(JarFile.java:72)
at sun.misc.URLClassPath$JarLoader.getJarFile(URLClassPath.java:646)
at sun.misc.URLClassPath$JarLoader.access$600(URLClassPath.java:540)
at sun.misc.URLClassPath$JarLoader$1.run(URLClassPath.java:607)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath$JarLoader.ensureOpen(URLClassPath.java:599)
at sun.misc.URLClassPath$JarLoader.<init>(URLClassPath.java:583)
at sun.misc.URLClassPath$3.run(URLClassPath.java:333)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:322)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:299)
at sun.misc.URLClassPath.getResource(URLClassPath.java:168)
at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
Could not find the main class: com.sun.tools.javac.Main. Program will exit.

To elaborate on #Peter Lawrey's answer ...
The start of the stacktrace is this:
Exception in thread "main" java.lang.UnsatisfiedLinkError: java.util.zip.ZipFile
.open(Ljava/lang/String;IJ)J
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:114)
...
The UnsatisfiedLinkError is thrown when you attempt to call a native method that has not been resolved to a method in the corresponding native library. The rest of the message tells us that the method at fault has the signature:
long java.util.zip.ZipFile.open(String, int, long)
and that meshes with the top frame of the stack trace ... and the fact that Java's ZipFile code is known to use a native library for the heavy lifting.
The fact that it has gotten this far means that the JVM has found the native library and loaded it. But apparently, the load didn't resolve this overload of the native open method. That can only mean one thing: that the version of the ZipFile class on the bootclasspath does not match the native library.
We cannot make any definite conclusions about whether this is a JDK or a JRE, but it seems likely that it is a JDK ... unless the OP is trying to call the Java compiler in a strange way. (The "could not find the main class: com.sun.tools.javac.Main" message probably means that the JVM could not load the class ... because of the UnsatisfiedLinkError breakage.)
Either way, JDK versus JRE is not the immediate problem. The real problem is a mismatch between the "rt.jar" on the JVM's bootclasspath, and the native libraries.
The question asks:
how to solve this then?
It depends on what exactly you did to get this error.
What command did you run?
What were the command line options and arguments?
Have you been "messing around" with your JRE / JDK installation?
Are you trying to use the "rt.jar" file from one installation in another one?

It means your rt.jar is for a different version of Java as your JVM.
I would ensure that you don't have a rt.jar in your boot class path and your JRE is installed correctly.
Could not find the main class: com.sun.tools.javac.Main. Program will exit.
When a class fails to load due to some low level error, it reports that the class could not be found.

The reference in the error message about not finding com.sun.tools.javac.Main leads me to believe that this is a program that needs to be run with the JDK rather than just a JRE.

your JRE path is pointing to the JDK path
Solution :
Step 1: Right click the server
Step 2: Click the Run Time Configuration
Step 3: GIVE the JRE path under the JDK.
Solution fixed

Apache Cassandra starting problem: Could not find the main class: Files\Apache

I am trying some Apache Cassandra examples and could run the server by calling the cassandra.bat file before. I didn't change anything deliberately, but now, Cassandra will not start.
I searched the Web for the error message "Could not find the main class: Files\Apache. Program will exit." and found out that there may be some space in a system variable called CATALINA_HOME, but I didn't set that variable ever. Do you know about a proper solution for this error?
C:\Program Files\Apache Cassandra\bin>cassandra
Starting Cassandra Server
Exception in thread "main" java.lang.NoClassDefFoundError: Files\Apache
Caused by: java.lang.ClassNotFoundException: Files\Apache
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
Could not find the main class: Files\Apache. Program will exit.

Perhaps you got a space in your Cassandra-Installation-Dir? Where did you install it?
Current Run-Scripts got problems on Windows if the Directory where you unzipped the file got a Space in it.
Perhaps your JAVA_HOME is set wrong? Open a console (Start -> Run -> cmd) and type
echo %JAVA_HOME%

Mac Indexing and CLASSPATH problems - java.lang.NoClassDefFoundError

System properties:
Java 1.6
Mac OSX version 10
Ant 1.8
Scenario: I am working on my final year project which is to create a website which uses Lucene to search my website and my database. I am working through lucene demos here
http://lucene.apache.org/java/2_3_2/demo.html
which talks about classpath
http://lucene.apache.org/java/2_3_2/demo3.html and a web example
I have created a .bash_profile file in my home directory /Users/philhunter/ which sets my classpaths:
CLASSPATH=${CLASSPATH}:/Users/philhunter/Desktop/COM562_Project/lucene-3.0.3/lucene-core-3.0.3.jar
CLASSPATH=${CLASSPATH}:/Users/philhunter/Desktop/COM562_Project/lucene-3.0.3/lucene-demo-3.0.3.jar
CLASSPATH=${CLASSPATH}:/Users/philhunter/Desktop/COM562_Project/lucene-3.0.3/src/demo/org/apache/lucene/demo
When i try and run the commands it asks on the command line i am getting ClassDefNotFoundError:
Exception in thread "main" java.lang.NoClassDefFoundError: /Users/philhunter/Desktop/COM562_Project/lucene-3/0/3/src/demo/org/apache/lucene/demo/IndexHTML
Caused by: java.lang.ClassNotFoundException: .Users.philhunter.Desktop.COM562_Project.lucene-3.0.3.src.demo.org.apache.lucene.demo.IndexHTML
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
The command line command is:
java /Users/philhunter/Desktop/COM562_Project/lucene-3.0.3/src/demo/org/apache/lucene/demo/IndexHTML -create -index /Applications/MAMP/htdocs/
which should index my website files. That indexHTML file is a java file in that last classpath directory above. Anyone know why I am getting theat error!?

I think the path you're passing is the problem. Try adding the following to your bash script
cd /Users/philhunter/Desktop/COM562_Project/lucene-3.0.3/src/demo/
java org.apache.lucene.demo.IndexHTML -create -index /Applications/MAMP/htdocs/
The problem is that when you run
java /Users/philhunter/Desktop/COM562_Project/lucene-3.0.3/src/demo/org/apache/lucene/demo/IndexHTML
you are telling java run the class in the package Users.philhunter.Desktop.COM562_Project.lucene-3.0.3.src.demo.org.apache.lucene.demo.