May 11, 2013 by
Category:

I have been working with WebLogic Server since 1999 when it was still a BEA Systems product. Though professionally I would characterize myself as an architect/developer, I have been working with WebLogic administrators for more than a decade. In fact, at BEA Systems I was the author of the original BEA WebLogic Administrator Certification exam. As a WebLogic consultant, the primary tools that I use with clients are the WebLogic Scripting Tool (WLST) and the WebLogic Diagnostic Framework (WLDF).

WLST is based on Jython, the all-Java version of Python. Since Jython runs in the JVM it is possible to invoke WLST commands directly form Java code. The possibilities are endless, you could use a Swing Gui front end and a WLST back end to provide automated management and monitoring for WebLogic.

Here is a simple example of WLST commands invoked from Java code. This code example uses a Runtime MBean to check how long the server has been running.

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import java.io.IOException;
import java.io.OutputStream;

// from weblogic.jar
import org.python.core.PyLong;
import org.python.util.InteractiveInterpreter;
import weblogic.management.scripting.utils.WLSTInterpreter;

public class WSTLClient
{
  public static void main(String[] args)
  {
    InteractiveInterpreter interpreter = new WLSTInterpreter();    

    // WLST output to dev/null
    interpreter.setOut(new NullOutputStream());

    // Run commands no results
    interpreter.exec("connect('user','password','t3://host:port')");
    interpreter.exec("serverRuntime()");

    // Run command with result
    PyLong result = (PyLong)interpreter.eval("cmo.getActivationTime()");

    // calculate uptime
    long startTime = result.getValue().longValue();    
    long currentTime = System.currentTimeMillis();
    long uptimeMilli = currentTime - startTime;
    long uptimeMins = (uptimeMilli / 1000L) / 60L;

    System.out.println( "Server Uptime: " + uptimeMins + "min");
  }

  // custom class to iplement noop output stream
  public static class NullOutputStream extends OutputStream
  {
    @Override public void write(int b) throws IOException {}
    @Override public void write(byte[] b) throws IOException {}
    @Override public void write(byte[] b, int off, int len) throws IOException { }
  }
}

WLST documentation can be found here. Feel free to use this code as the basis for your own scripts.

For more information on WebLogic Administration, Web Age Solutions offers a full line of WebLogic training courses. Check out our WebLogic classes at WebAgeSolutions.com.

7 Comments

Divya

Hi,

I tried to run the code above as Java application.But getting the below exception :
Exception in thread “main” java.lang.NullPointerException
at java.io.File.(Unknown Source)
at weblogic.management.utils.PDevHelper.getUpgradeLaunchLocation(PDevHelper.java:77)

Can you please help me with it and provide me any configuration changes are required.I have added all the required jars in classpath.

Reply
Stuart Smith

Without seeing the exact code you have it is hard to say.

I would say the most likely issue is in the lines that use ‘interpreter.exec’. These lines have double and single quotes, forward slashes (to avoid the ‘escape the backslash in Java’ issue), and you have to substitute your user, password, and host:port of the WebLogic server.

Reply
bibin

I am hitting with the same issue divya has mentioned.

Exception in thread “main” java.lang.NullPointerException
at java.io.File.(File.java:251)
at weblogic.management.utils.PDevHelper.getUpgradeLaunchLocation(PDevHelper.java:77)
at weblogic.management.utils.PDevHelper.getPDevClassLoader(PDevHelper.java:36)
at weblogic.management.scripting.utils.WLSTUtil.setupOffline(WLSTUtil.java:226)
at weblogic.management.scripting.utils.WLSTInterpreter.(WLSTInterpreter.java:134)
at weblogic.management.scripting.utils.WLSTInterpreter.(WLSTInterpreter.java:76)
at HelloClient.main(HelloClient.java:6)

Code is

package weblogic;

import org.python.core.PyLong;
import org.python.util.InteractiveInterpreter;
import weblogic.management.scripting.utils.WLSTInterpreter;
public class HelloClient {
public static void main(String[] args) {
InteractiveInterpreter interpreter = new WLSTInterpreter();
interpreter.exec(“connect(‘weblogic’,’weblogic1′,’t3://myserver:7011′)”);
interpreter.exec(“serverRuntime()”);
PyLong result = (PyLong) interpreter.eval(“cmo.getActivationTime()”);
long startTime = result.getValue().longValue();

System.out.println(“Server Uptime: ” startTime “min”);
}

}

Reply
Abe

Hi,
I try to running the code but it was failed, with the following error :

Exception in thread “main” java.lang.NoClassDefFoundError: weblogic/management/scripting/utils/WLSTMsgTextFormatter
at weblogic.management.scripting.utils.WLSTUtilHelper.(WLSTUtilHelper.java:36)
at weblogic.management.scripting.utils.WLSTInterpreter.(WLSTInterpreter.java:104)
at wlst.WSTLClient.main(WSTLClient.java:13)
Caused by: java.lang.ClassNotFoundException: weblogic.management.scripting.utils.WLSTMsgTextFormatter
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
… 3 more
Java Result: 1

Did I missing something? I’ve tried to search using googling about where I can find/download those class but no result.

Any help is appreciated.

Thx.

Reply
Abe

-continuing previous comment-

the environment configuration that i used are :
Netbeans 8 IDE
weblogic-classes.jar (from WLAS 12c)
JDK 8
OS Windows 7

Can anyone give hint about my issue?
Any help is appreciated.
Thx.

Reply
swatantra

same problem. tried enough of googling but couldn’t find this class. Please help

Exception in thread “main” java.lang.NoClassDefFoundError: weblogic/management/scripting/utils/WLSTMsgTextFormatter
at weblogic.management.scripting.utils.WLSTUtilHelper.(WLSTUtilHelper.java:36)
at weblogic.management.scripting.utils.WLSTInterpreter.(WLSTInterpreter.java:104)
at wlst.WSTLClient.main(WSTLClient.java:13)
Caused by: java.lang.ClassNotFoundException: weblogic.management.scripting.utils.WLSTMsgTextFormatter
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) – See more at: https://www.webagesolutions.com/blog/archives/879#sthash.rVY8tq0J.dpuf

Reply
Chellappan S

I am excuting basic WLST command, when I does, I am getting below error:

java.lang.NullPointerException
at weblogic.management.scripting.utils.WLSTInterpreter.(WLSTInterpreter.java:116)
at weblogic.management.scripting.utils.WLSTInterpreter.(WLSTInterpreter.java:76)
at WLSTClient.main(WLSTClient.java:12)

Reply

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