classloader

I created an Android application with IR blaster and I want my code to check if an Android device supports these libraries. When another device installs my app, it crashes. How can I avoid this? I want my code to get info about whether the phone supports my app. This is a similar problem to loading JDBC drivers. If the drivers don't exist you don't want to crash out your entire app. The basic principle of the solution is to use Class.forName() This lets you check if the class exists and throws an exception if it doesn't. Edit: To be clear - the reason why this works and why this is necessary

I'm making a maven plugin that run in test phase, in pom.xml configuration of a project that uses my plugin, I'm setting a class canonical name that I want to use to run that class from my plugin, basically I'm making a way to have a dynamic class loading of classes inside the project from my plugin. Class clazz = Class.forName("... class from pom.xml ...") When I run it I receive the expectable "ClassNotFoundException", seems the class loader are not the same or not shared. There is a way to do it? Like capture the class loader from the project or receive it by dependency injection into my

I have a project which uses two versions of bouncyCastle jars bcprov-jdk15 and bcprov-jdk16. The jvm loads the older version but there is a feature I wrote which needs the newer version to run. I tried to solve this classpath hell by using a custom class loader. After some googling and with the help of some previous Stackoverflow answers [1] [2] and this blog , I wrote the following Parent Last Class loader to load the classes from the newer jar before delegating to the parent class loader. public class ParentLastClassLoader extends ClassLoader { private String jarFile; //Path to the jar file

Brief: Tomcat6 can't recognize my ojdbc14.jar in WebRoot/WEB-INF/lib. I suppose I don't need to configure anything, just putting the .jar file in there and it should work. Details: I've created a web application and put ojdbc14.jar in WEB-INF/lib folder. When I start Tomcat6 and access an index.jsp page which creates an object that initiates a connection to my oracle database , an error occurs saying "Cannot load JDBC driver class 'oracle.jdbc.OracleDriver'". Apparently Tomcat6 can't recognize the 'oracle.jdbc.OracleDriver' class in web-inf/lib/ojdbc14.jar . I've done some research and

I've converted an application to be built and deployed with Maven instead of RAD's built-in tools. It's mostly gone well, but the last "gotcha" is that the application needs a class loader policy of "parent last/application". I'd like to automate this because currently, when I use the WAS plugin for Maven , it seems to uninstall and reinstall the application completely, and so I have to go through the admin console every time the code changes and the application is redeployed. If I could have the class loader settings built in to the deployed EAR, work would go much faster. From what I can

I'm trying to force the System java classloader (i.e. ClassLoader.getSystemClassLoader() ) to load an external class defined by a byte array with valid bytecode so that other classes subsequently loaded by this classloader can know about and instantiate the external class without getting a NoClassDefFoundError . This surely does not work as it only defines the class on the classloader created, not in the System classloader: URLClassLoader child = new URLClassLoader(new URL[] { myJar.toURI().toURL() , ClassLoader.getSystemClassLoader()); Class.forName ("com.MyClass", true, child); The code

I have a jar in server/default/lib which contains Foo.class , Bar.class and the same class is there in my application/WEB-INF/classes which is deployed in server/default/deploy . and Example.class is using the Foo.class instance and Bar.class instance Now the situation is that Example.class shoud use the Foo.class in my application and Bar.class in default/lib jar file. i.e. my application should use the classes in the application clases folder if not found in classes folder then it should use the class in default/lib jar files. To do i have defined jboss-web.xml file <jboss-web> <class

Say I have this code that uses some input (e.g. a URL path) to determine which method to run, via reflection: // init map.put("/users/*", "viewUser"); map.put("/users", "userIndex"); // later String methodName = map.get(path); Method m = Handler.class.getMethod(methodName, ...); m.invoke(handler, ...); This uses reflection so the performance can be improved. It could be done like this: // init map.put("/users/*", new Runnable() { public void run() { handler.viewUser(); } }); map.put("/users", new Runnable() { public void run() { handler.userIndex(); } }); // later Runnable action = map.get