classloader

I compile my programm against javaee-api. But for Junit testing I must use a specific implementation like glassfish's javaee.jar to avoid errors like java.lang.ClassFormatError: Absent Code attribute in method that is not native or abstract in class file javax/persistence/Persistence (see also 1 ). So avoid using methods, that are only available in glassfish implementation, I want to compile my artifact with the general api, but run junit with the implementation jar. But both provide equal named classes and inferfaces, so the class loader gets in trouble. What is the best way to solve this

I am trying to use ClassLoader getResourceAsStream() My Direcory structure is like below: Project1 -src -main -java -webapp -WEB-INF -MYLOC -someprops.properties For classloader.getResourceAsStream("MYLOC/someprops.properties") works fine. But now I have to move the properties file outside of the .war, like in C:\someprops.properties But, classloader.getResourceAsStream("C:\someprops.properties") does not work. Can it not use an absolute path? If you have a native file path then you don't need to use getResourceAsStream , just create a FileInputStream in the normal way. Properties props = new

How would one go about instantiating an Enum type via a ClassLoader or similar mechanism? (I'm trying to keep everything under the same context classloader for a standalone server application). I have something like: ClassLoader loader = new CustomClassLoader(parent, libDir); Thread.currentThread().setContextClassLoader(loader); // trouble area Class<?> containerClass = loader.loadClass("com.somepackage.app.Name$SERVER"); I had wrongly thought simply loading the Enum would be enough to kick it off (it's private constructor contains startup method calls and what-not). Doing what I have above

You'll probably ask, why would I want to do that - it's because I'm using a class (from an external library) which does stuff in its static initializer and I need to know whether it's been done or not. I looked at ClassLoader , but didn't find anything that looked useful. Any ideas? Colin Hebert You can use the ClassLoader.findLoadedClass() method. If it returns null, then the class isn't loaded. This way you don't load the class if it wasn't already loaded. WARNING : This code doesn't really work here, in the system ClassLoader, findLoadedClass() is protected, you need to override it with

today I ran into this problem which really bugs me, as almost the code already worked (and stopped working even after reverting to the older version). I'm accessing a Spring-Bean on a Facelets-Page. Spring wraps these objects in Proxies to use aspects and some other stuff. The problem is, that I get an exception when trying to access the property of a bean. The exception is something like this: javax.el.PropertyNotFoundException: /customers.xhtml @23,27 value="#{customerBean.customer}": Property 'customer' not found on type $Proxy88 I know for sure (!!) that the according getter/setter methods

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 a dependent class com/jcraft/jsch/Logger It is not enough to have Ant's optional JARs you need the JAR

Is there a guarantee that (the default, system) Java class loader doesn't attempt to load classes that aren't referred to in the code being run? A couple of examples of what I mean: I'm using a framework.jar which I know to contain references to another library.jar 's classes in it, but I'm using only such part of the framework that doesn't contain those references. Is it safe to leave library.jar out? Static blocks are run when a class is first loaded. If no running code contains references to a specific class, is it sure that it's static block is not run? Quickly testing it seems to work as