classloader

问题 i'm writing a custom class loader to load some of my classes (not all). Class loader are very simple: public Class loadClass(String className, boolean resolve) throws ClassNotFoundException { Class cls=findLoadedClass(className); if(cls!=null) { return cls; } // Search first for encrypted classes cls=decryptClass(className); if(cls==null) { // Then try with default system classloader cls=super.loadClass(className, resolve); } return cls; } And this is how i use it: // In my Launcher class

问题 I am trying to debug an application that is working properly when tested locally on a Windows XP machine (version 5.1 build 2600 Service Pack 3) through Websphere Platform 6.1 running java version 1.5. This application is throwing an ArrayStoreException when it is deployed to UNIX servers (SunOS, version 5.10) running java version 1.5.0_24. I am leaning towards this being an environment configuration issue, but (other than it working locally) I can't seem to confirm that it's a configuration

问题 In my application i'm using ServiceLoader to load modules(classes from .jar file) with different ClassLoaders in order to completely unload them when not needed from the context of the application and from the JVM itself. I know maybe is not a common topic "unload classes from JVM", there are some conditions for that to happen, so i am making the necessary effort. To make sure if all is working like expected i'm tracing the load and unload of classes with -XX:+TraceClassLoading and -XX:

问题 Is there a way to force com.sun.jersey.* in the WAR to be used over org.apache.* in the WAR? Or is this done automatically based on the order? <prefer-application-packages> <package-name>com.sun.jersey.*</package-name> <package-name>org.apache.*</package-name> <package-name>antlr.*</package-name> <package-name>javax.ws.rs.*</package-name> </prefer-application-packages> 回答1: This question doesn't tell us what you are actually trying to do. However, I'm guessing that you are trying / hoping to

问题 I'm getting the following exception while running Camel (2.9.1) on Tomcat (apache-tomcat-7.0.26) with Spring (3.0.5.RELEASE). Any pointers would be appreciated. Thanks. Mar 12, 2012 3:03:48 PM org.apache.catalina.loader.WebappClassLoader validateJarFile INFO: validateJarFile(/Users/XXXX/Documents/apache-tomcat-7.0.26/webapps/myapp/WEB-INF/lib/geronimo-servlet_2.5_spec-1.1.2.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class [ http-bio-8080

问题 I am trying to load in text files on the fly and compile them. File file = new File("Files/"+fileName+".java"); JavaCompiler compiler = ToolProvider.getSystemJavaCompiler(); compiler.run(null, null, errStream, file.getAbsolutePath()); I then will load the compiled .class files later: public Class loadStrategyClass(File strategyClassFile) throws IOException { FileChannel roChannel = new RandomAccessFile(strategyClassFile, "r").getChannel(); ByteBuffer buffer = roChannel.map(FileChannel.MapMode

问题 This question already has answers here : How to load a jar file at runtime [duplicate] (5 answers) Closed 6 years ago . My Application needs some components (jar files) to be loaded/unloaded dynamically on request. For example, I have abc.jar and xyz.jar and on demand my application should be able to load/unload abc.jar or xyz.jar or replace these jars with different versions of jars. Could you someone please help me with any ideas to load/unload jar files dynamically (i.e. without restarting

问题 I am moving my code from JDK 8 to Open JDK 12. While doing so, I am facing following issue : java.lang.NoSuchFieldException: scl while trying to call ClassLoader.class.getDeclaredField("scl"). This was working fine in Java 8 but no longer works in newer Java versions. I did some findings and believe it has got to do with the way working of reflection and use of internal Java packages have changed since Java 8. Set<URL> classLoaderUrls = computeClassLoaderUrls(); ClassLoader

问题 I am implementing the AbstractFactory pattern allowing outsiders to create Factories. I am reading the factory implementation name from a properties file, loading the factory class and using it to construct objects. Problem is that somewhere in my factory implementation when I'm trying to create an object of a task I get the following error: Exception in thread "Thread-1" java.lang.ClassFormatError: Code segment has wrong length in class file com/testsuite/loadperformancetesterusage/tasks

问题 I have a fairly complex object graph serialized out from Scala-2.9 and I need to read it into Scala-2.10. However, somewhere deep in the object graph Scala-2.10 throws: ! java.lang.ClassNotFoundException: scala.collection.JavaConversions$SeqWrapper ! at java.net.URLClassLoader$1.run(URLClassLoader.java:366) ~[na:1.7.0_21] ! at java.net.URLClassLoader$1.run(URLClassLoader.java:355) ~[na:1.7.0_21] ! at java.security.AccessController.doPrivileged(Native Method) ~[na:1.7.0_21] ! at java.net