CODEWITHSUNDEEP
javamultithreadingclasspath
Kongol
Kongol

Reputation: 403

NoClassDefFoundError in threads

Hi I got a exception NoClassDefFoundError when I run a thread. This process runs well when i execute without threads, but when I execute the start method, I got this error in different statements

Is it possible that threads got a different class path that the main thread?

thanks edit to add code

Run method:

public void run(){
    try{
        boolean startAction = HeapThread.addAction(idCliente, idThread, Constants.ACTION_CREATE_TOPIC);
        if (!startAction) {
            synchronized (this){
                this.wait();
            }
        }
        createTopic();
    }
    catch(Exception ex){
        log.error("Error", ex);
    }
    finally {
        Long nextIdThread = HeapThread.getNextAction(idCliente, idThread, Constants.ACTION_CREATE_TOPIC);
        if (nextIdThread > 0){
            log.debug("Thread");
            ThreadState thread = HeapThread.getState(nextIdThread);
            synchronized (thread) {
                thread.notify();
            }
        }
    }
}

createTopic() function calls searchBlog() and there I call this

try{
        sessionId = SessionWS.createSession(url, false);
        CrawlerSearch crawler = new CrawlerSearchAPIService(new URL(url + Constants.URL_CRAWLER), new QName(Constants.QNAME_CRAWLER, "CrawlerSearchAPIService")).getCrawlerSearchAPIPort();
        // para cada topico obtnemos 10 blogs
        for (Long idTopic : blogsTopics.keySet()) {

...

and full exception is:

java.lang.NoClassDefFoundError: com/befasoft/common/business/webservices/client/Session
at com.befasoft.common.business.webservices.client.SessionAPIService.getSessionAPIPort(SessionAPIService.java:56)
at com.befasoft.common.business.webservices.SessionWS.createSession(SessionWS.java:21)
at com.humanlike.web.tools.Crawler.searchBlogs(Crawler.java:50)
at com.humanlike.web.theads.CreateTopic.createTopic(CreateTopic.java:164)
at com.humanlike.web.theads.CreateTopic.run(CreateTopic.java:63)

Upvotes: 4

Views: 412

Answers (2)

Kongol
Kongol

Reputation: 403

Solver, I just have to especify the thread class loader with that

ct.setContextClassLoader(ClassLoader.getSystemClassLoader());

Thx Anantha Sharma for guide me

Upvotes: 1

Vadzim
Vadzim

Reputation: 26180

My guess is that com.befasoft.common.business.webservices.client.Session had previously failed with ExceptionInInitializerError. This gives NoClassDefFoundError for subsequent calls. Check the log from beginning.

Upvotes: 1

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