This is an ordinary java project. Not a plug-in or anything else - just normal command line app.
Environment
Eclipse Version: 3.2.0
WTP 1.5
Linux 2.6.10-5-k7
ubuntu breezy
Hibernate 3.1.3
java.vm.vendor=Sun Microsystems Inc.
java.vm.version=1.5.0_04-b05
Ok, here is the problem which I only get this issue inside of Eclipse. From the command line I get way past this issue.
In the code below I only get to
new Configuration() when things go wrong. See code and excpetion below.
Code:
try
{
// Create the SessionFactory from hibernate.cfg.xml
Configuration c= new Configuration();
c.configure();
sessionFactory = c.buildSessionFactory();
logInfo("AnalyzeRawTripData Initialized");
}
catch (Throwable ex)
{
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
logException("unable to Initialize AnalyzeRawTripData",ex);
}
exceptionCode:
java.lang.ExceptionInInitializerError
at com.travelbahn.xgwStats.AnalyzeRawTripData.init(AnalyzeRawTripData.java:50)
at com.travelbahn.xgwStats.XGWStatsProcess.process(XGWStatsProcess.java:53)
at com.travelbahn.xgwStats.XGWStatsProcess.main(XGWStatsProcess.java:196)
Caused by: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: java.lang.NullPointerException (Caused by java.lang.NullPointerException) (Caused by org.apache.commons.logging.LogConfigurationException: java.lang.NullPointerException (Caused by java.lang.NullPointerException))
at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:543)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)
at org.hibernate.cfg.Configuration.<clinit>(Configuration.java:116)
... 3 more
Caused by: org.apache.commons.logging.LogConfigurationException: java.lang.NullPointerException (Caused by java.lang.NullPointerException)
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:397)
at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)
... 7 more
Caused by: java.lang.NullPointerException
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:374)
... 8 more
I've traced this down into the bowls of common-logging api into
org.apache.commons.logging.impl.LogFactory in the method
getLogConstructor() (see below). What happens in the line
logInterface = this.getClass().getClassLoader().loadClass... the first call
this.getClass() returns null and thus as the stack unwraps you get the exception above.
So why does this.getClass() return null? Only thing in the code and java docs says that some JVM's will return null (lots of help there).
Code:
protected Constructor getLogConstructor()
throws LogConfigurationException {
// Return the previously identified Constructor (if any)
if (logConstructor != null) {
return logConstructor;
}
String logClassName = getLogClassName();
// Attempt to load the Log implementation class
Class logClass = null;
Class logInterface = null;
try {
logInterface = this.getClass().getClassLoader().loadClass [b]<-- this.getClass returns null[/b]
(LOG_INTERFACE);
logClass = loadClass(logClassName);
if (logClass == null) {
throw new LogConfigurationException
("No suitable Log implementation for " + logClassName);
}
if (!logInterface.isAssignableFrom(logClass)) {
Class interfaces[] = logClass.getInterfaces();
for (int i = 0; i < interfaces.length; i++) {
if (LOG_INTERFACE.equals(interfaces[i].getName())) {
throw new LogConfigurationException
("Invalid class loader hierarchy. " +
"You have more than one version of '" +
LOG_INTERFACE + "' visible, which is " +
"not allowed.");
}
}
throw new LogConfigurationException
("Class " + logClassName + " does not implement '" +
LOG_INTERFACE + "'.");
}
} catch (Throwable t) {
throw new LogConfigurationException(t);
}
// Identify the <code>setLogFactory</code> method (if there is one)
try {
logMethod = logClass.getMethod("setLogFactory",
logMethodSignature);
} catch (Throwable t) {
logMethod = null;
}
// Identify the corresponding constructor to be used
try {
logConstructor = logClass.getConstructor(logConstructorSignature);
return (logConstructor);
} catch (Throwable t) {
throw new LogConfigurationException
("No suitable Log constructor " +
logConstructorSignature+ " for " + logClassName, t);
}
}
Let me also say this only happens in Eclipse. Using a small script to run the app from the command line seems to work just fine.
I've built other apps in Eclipse which do straight JDBC and everything is good there. My only issue is with running Eclipse and Hibernate together. Odd thing is I can use the Hibernate tools (for the most part) with little trouble but can't run the code.
One other piece of info is if I put the following just before the contructor; works but it still fails in the hibernate constructor.
Code:
Class.forName("org.apache.commons.logging.LogFactory");
Been fighting this thing for a week and can't seem to get anywhere on what is causing the issue?
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