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Asked: 2026-05-11T03:43:48+00:00

Note I’m running windows, the path just looks like it’s linus because I typed

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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?

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1 Answer

  1. Replace the colon with a semicolon:

    java -classpath .;ojdbc6.jar DBDiagnostics <connectionString>
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