I am moving my old SpringBoot 2 / Java 8 application to the newer SpringBoot 3 / Java 17.
My issue is related to the Weblogic T3 client. Until now I used the wlthint3client
artifact coming from a Weblogic 12.2.1.3 installation (compiled by Java 8) which runs with no issues.
Using the same artifact inside the new architecture, based on SpringBoot 3 / Java 17 the new InitialContext(environment)
instruction stucks forever!!!
Could anybody tell me if there exist a newer release of the Weblogic Client, or a workaround for that issue?
Here is a fragment of the code which uses the client:
public static MyRemoteEJB lookup(
String clusterAddress,
String userName,
String password
)
throws NamingException
{
Properties environment = new Properties();
environment.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");
environment.put(Context.PROVIDER_URL, clusterAddress);
if (null != userName) {
environment.put(Context.SECURITY_PRINCIPAL, userName);
}
if (null != password) {
environment.put(Context.SECURITY_CREDENTIALS, password);
}
environment.put("weblogic.jndi.allowExternalAppLookup", "true");
environment.put("weblogic.jndi.relaxVersionLookup", "true");
InitialContext context = new InitialContext(environment);
String resourceName = String.format(
"remote-app#%s",
MyRemoteEJB.class.getName()
);
return (MyRemoteEJB)context.lookup(resourceName);
}
Thank you so much!
With a lot of effort, I finally solved the issue!
I am going to describe which the solution is, and how I achieved it.
The first step was to ask to the Oracle support, provided by my company, the Jakarta version of the Weblogic T3 Thin Client shipped with Weblogic 14.1.1.0.
I decompiled and debugged it by the IntelliJ built-in java decompiler to get enough information to active and redirect the T3 client debug logs to my console (look at the below source code).
Here the relevant source code:
logging.properties
handlers=java.util.logging.ConsoleHandler
.level=FINE
java.util.logging.ConsoleHandler.level=FINE
java.util.logging.ConsoleHandler.formatter=java.util.logging.SimpleFormatter
Main.java
package org.example;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import java.util.Properties;
import java.util.logging.Logger;
public class Main {
private static final Logger logger = Logger.getLogger(Main.class.getName());
private static void loggerSetup() {
String pwd = System.getenv("PWD");
System.setProperty(
"java.util.logging.config.file",
(pwd + "/src/main/resources/logging.properties")
);
System.setProperty("com.bea.core.debug.DebugLegacy.stdout", "true");
System.setProperty("weblogic.diagnostics.debug.DebugLogger.DISABLED", "false");
System.setProperty("weblogic.debug.DebugAbbrevs", "true");
System.setProperty("weblogic.debug.DebugAllowList", "true");
//System.setProperty("weblogic.debug.DebugClassLoadingContextualTrace", "true");
//System.setProperty("weblogic.debug.DebugClassLoadingVerbose", "true");
System.setProperty("weblogic.debug.DebugCluster", "true");
System.setProperty("weblogic.debug.DebugClusterVerbose", "true");
System.setProperty("weblogic.debug.DebugConnection", "true");
System.setProperty("weblogic.debug.DebugDGCEnrollment", "true");
System.setProperty("weblogic.debug.DebugFailOver", "true");
System.setProperty("weblogic.debug.DebugGenericMethodDescriptor", "true");
System.setProperty("weblogic.debug.DebugJNDI", "true");
System.setProperty("weblogic.debug.DebugJVMID", "true");
System.setProperty("weblogic.debug.DebugLegacy", "true");
System.setProperty("weblogic.debug.DebugLoadBalancing", "true");
System.setProperty("weblogic.debug.DebugMessaging", "true");
System.setProperty("weblogic.debug.DebugRMIRequestPerf", "true");
System.setProperty("weblogic.debug.DebugRouting", "true");
System.setProperty("weblogic.debug.DebugStubGeneration", "true");
System.setProperty("weblogic.debug.ServerHelp", "true");
}
private static Object lookup(
String clusterAddress,
String userName,
String password
)
throws NamingException
{
Properties environment = new Properties();
environment.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");
environment.put(Context.PROVIDER_URL, clusterAddress);
if (null != userName) {
environment.put(Context.SECURITY_PRINCIPAL, userName);
}
if (null != password) {
environment.put(Context.SECURITY_CREDENTIALS, password);
}
environment.put("weblogic.jndi.allowExternalAppLookup", "true");
environment.put("weblogic.jndi.relaxVersionLookup", "true");
InitialContext context = new InitialContext(environment);
String resourceName = String.format(
"remote-app#%s",
MyRemoteEJB.class.getName()
);
return context.lookup(resourceName);
}
public static void main(String[] args) {
loggerSetup();
logger.info("Connecting...");
try {
Object myRemoterEJB = lookup("t3://127.0.0.1:7002", null, null);
if (null != sogeiAdapterEJB) {
logger.info("Remove EJB got!");
}
} catch(NamingException e) {
String message = e.getMessage();
if (message.contains("MyRemoteEJB")) {
logger.info("Remote EJB got, but not marshaled.");
} else {
logger.severe(message);
}
}
}
}
Running it I got several exceptions, but only one really related to my problem:
java.lang.reflect.InaccessibleObjectException: Unable to make private static java.lang.ClassLoader java.io.ObjectInputStream.latestUserDefinedLoader() accessible: module java.base does not "opens java.io" to unnamed module @50675690
The above one was the root cause of:
Try to create JVM connection 1 time, encounter : java.io.IOException: Timed out while attempting to establish connection to :t3://127.0.0.1:7002
The solution was provided by this post, so I added the JVM arguments:
--add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.io=ALL-UNNAMED
All the connections issues are gone!!!