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| Locating additional classes in a custom Java Node. |
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Message
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| kolban |
 Posted: Sun Oct 13, 2002 5:38 pm Post subject: Locating additional classes in a custom Java Node. |
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Grand Master
Joined: 22 May 2001
Posts: 1072
Location: Fort Worth, TX, USA
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Folks,
I am trying to use JNDI within a custom Java node.
I have the following code fragment ...
| Code: |
Hashtable environment = new Hashtable();
environment.put(
Context.INITIAL_CONTEXT_FACTORY,
"com.sun.jndi.fscontext.RefFSContextFactory");
environment.put(
Context.PROVIDER_URL,
"file:/C:/MQ/MQSIV2/Nodes/Projects/JMSOutput/JNDI");
try {
Context ctx = new InitialDirContext(environment);
...
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At run-time, an exception is thrown which contains:
Naming exception: javax.naming.NoInitialContextException: Cannot instantiate class: com.sun.jndi.fscontext.RefFSContextFactory [Root exception is java.lang.ClassNotFoundException: com/sun/jndi/fscontext/RefFSContextFactory]
Does anyone know where I should place my "fscontext.jar" file in order for the WMQI broker to pick it up? |
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| kolban |
| Posted: Sun Oct 13, 2002 5:45 pm Post subject: |
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Grand Master
Joined: 22 May 2001
Posts: 1072
Location: Fort Worth, TX, USA
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It gets more interesting .... it looks like it may not be the location of external JAR files but something in JDNI ... found a match and recreated from
Google. |
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| kolban |
| Posted: Sun Oct 13, 2002 6:19 pm Post subject: |
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Grand Master
Joined: 22 May 2001
Posts: 1072
Location: Fort Worth, TX, USA
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Now it gets ugly again. In my custom node class, I created a method called test as follows:
| Code: |
public void test() {
out.println("About to obtain a JNDI lookup context ...");
Hashtable environment = new Hashtable();
environment.put(
Context.INITIAL_CONTEXT_FACTORY,
"com.sun.jndi.fscontext.RefFSContextFactory");
environment.put(
Context.PROVIDER_URL,
"file://C:/MQ/MQSIV2/Nodes/Projects/JMSOutput/JNDI");
try {
Context ctx = new InitialDirContext(environment);
out.println("Retrieved context!");
} catch (NamingException e) {
out.println("Naming exception: " + e.toString());
out.println("Explanation: " + e.getExplanation());
e.printStackTrace(out);
}
}
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Here is the odd thing ...
when this method is called within the node constructor, no exception is thrown. When called in the evaluate() callback, the exception is thrown!!!
Yikes!!! |
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| kolban |
| Posted: Mon Oct 14, 2002 8:24 am Post subject: |
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Grand Master
Joined: 22 May 2001
Posts: 1072
Location: Fort Worth, TX, USA
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Folks,
Finally got there after finding the following on Google.
Adding the code
| Code: |
Thread.currentThread().setContextClassLoader(this.getClass().getClassLoader());
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solved the problem. |
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