classloader

问题 Does anyone have any experience in using the ReloadingClassLoader of the Apache Commons JCI API? The only usage example can found in the following page: http://commons.apache.org/jci/usage.html I am assuming that whenever the directory or jar changes, it will automatically reload the classes within the classloader? If so, you would have to load/instantiate a previously loaded/instantiated class (by calling loadClass()) again to use the newly modified class? Is that correct? Hope this is clear

问题 I am deploying a J2EE web application in Websphere Application Server 8.5. The web application has a shared library with all the third party libraries. All the internally coded libraries are inside the WEB-INF/lib folder. The problem is that in only some jsps WAS it is throwing the following exception. I think it is related with xercesImpl-2.8.1.jar but I don't understand why it is throwing this exception and why it is throwing in only some pages. In tomcat it is working perfectly. java.lang

问题 Are there any tools that can be given a classpath or folder, and will search through all the .jar files looking for references to a particular class? It would have saved me a day of searching in order to resolve this kind of problem. In my case I had to find out where a rogue reference to a class was coming from, as it was stopping JBoss from starting correctly due to a NoClassDefFoundError . I suppose I am looking for this: java -jar magicbullet.jar /path/to/search com.myproject.DodgyClass

问题 HERE IS THE HEAD DUMP (UPDATED ON 10/29/2013) I'm working in a webapp with: Tomcat 7.0.24 Java 6 Spring 3 (with aop - cglib) SLF4J over Log4j Oracle Coherence After a lot of work, I managed to remove all the strong reference to the class loader and now it is a candidate for the garbage collector. So, memory leak solved? Of course not! Because after several hot deployments a OOME appears due to PermGen space. Thanks to Yourkit, I was able to check that the WebappClassLoader was Pending

问题 I have an app, let us call it 'com.company.foo', with a main Activity 'FooBar'. In my AndroidManifest.xml, I have <application android:label="@string/app_name" android:icon="@drawable/icon" android:theme="@android:style/Theme.NoTitleBar.Fullscreen" > <activity android:name="FooBar" android:label="@string/app_name" android:configChanges="keyboardHidden|orientation" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /

问题 Can Thread.getContextClassLoader() be null ? The javadoc is not really clear. Should a library take this case into account ? Update: the reason I asked is that beansbinding.dev.java.net does not work in this case (and my code does setContextClassLoader(null) 回答1: Java threads created from JNI code in a non-java thread have null ContextClassloader unless the creator explicitly sets it. Also in such context Thread.currentThread() returns null. 回答2: Yes you should, someone could have called

问题 I expose my context : I have two Java programs that run on a unique Weblogic Server : program A and program B. These ones are launched by two ksh : programA.ksh and programB.ksh Both need C.jar but in different versions (but with exactly the same package and classes) : program A need C-1.0.jar program B need C-2.0.jar I precise that both programs share the same weblogic classpath. So, my classpath contains in that order : ..... C-1.0.jar C-2.0.jar ..... How can I do so that each program finds

问题 What happens when you have the same compiled class twice in a war deployed in tomcat? (I know it's not a good practice and so on, but what happens behind the scene?) Are there chances of nasty side-effects? 回答1: I would expect the behaviour is the same as anywhere else you have that situation. The first class found by the class loader will be used, the other will be ignored. 回答2: If you have one class is in WEB-INF/classes and the other in a jar, the one in WEB-INF/classes will have priority.

问题 I'm using java in Eclipse (windows), and I'm trying to use: myClass.getResource("/image.jpg"), While image.jpg exists in the root loacation "myProject/". It returns null. I checked many other threads but none of them resolved my issue. So I tried to evaluate this: this.getClass().getResource("/").getPath(); and it returned "myProject/build/classes". So I checked the project's configuration for this dir, and found the exact same dir under Java Build Path --> Source --> Default output folder My

问题 I have a problem with my Ant script. I need to copy a file to Linux server <copy file="../Ant/lib/jsch-0.1.50.jar" tofile="${ant.home}/lib/jsch-0.1.50.jar" /> <scp todir="${server.user}:${server.password}@${server.dev}:${server.dev.dir.config}" trust="true" verbose="true"> <fileset dir="${src.home}/Config/"> <include name="**/*" /> </fileset> </scp> File is copied correctly, but I receive this error: BUILD FAILED C:\dev.xml:179: Problem: failed to create task or type scp Cause: Could not load