classloader

I'm looking to write a custom class loader that will load a JAR file from across a custom network. In the end, all I have to work with is a byte array of the JAR file. I cannot dump the byte array onto the file system and use a URLClassLoader . My first plan was to create a JarFile object from a stream or byte array, but it only supports a File object. I've already written up something that uses a JarInputStream : public class RemoteClassLoader extends ClassLoader { private final byte[] jarBytes; public RemoteClassLoader(byte[] jarBytes) { this.jarBytes = jarBytes; } @Override public Class<?>

I'm still relatively new to Java, so please bear with me. My issue is that my Java application depends on two libraries. Let's call them Library 1 and Library 2. Both of these libraries share a mutual dependency on Library 3. However: Library 1 requires exactly version 1 of Library 3. Library 2 requires exactly version 2 of Library 3. This is exactly the definition of JAR hell (or at least one its variations). As stated in the link, I can't load both versions of the third library in the same classloader. Thus, I've been trying to figure out if I could create a new classloader within the

I frequently run into the problem that I have to preserve state between several invocations of an activity (i.e. going through several onCreate()/onDelete() cycles). Unfortunately, Android's support for doing that is really poor. As an easy way to preserve state, I thought that since the class is only loaded once by the class loader, that it would be safe to store temporary data that's shared between several instances of an activity in a static Bundle field. However, occasionally, when instance A creates the static bundle and stores data in it, then gets destroyed, and instance B tries to read

I am currently trying to implement hot class reloading in a Java application, however there are so many plugins to choose from and I cannot find a good comparison between the options. Also the websites of the plugins are not all very clear on what the exact features are and how to use them. There is also the option of making a custom hot class reloading ClassLoader , but I feel like that is similar to "reinventing the wheel" if there are already so many plugins which can do the job.. do other people agree with this? The Java plugins I found which I think can do the job: JRebel Dynamic Code

I could not find a clear answer to this question elsewhere, so I'll try here: Is there some way (programmatic or other) to get a list of JARs/classes loaded by an Application Classloader in the precise order they were loaded? By Application Classloader I mean the classloader that loads an EAR application in an applications server (WLS, WAS, JBoss...), but obviously, it applies to any classloader. So, to generalize, what I would like to find out is the list and order of JARs loaded by a specified classloader. Not individual classes, that is easy enough to find out by calling the classloader

Can anyone point me a good resource or explain me about the concept behind Class Loaders? I found the following resource on class loaders http://www.onjava.com/lpt/a/5586 but still no help. The following questions may look silly but trying to answer them always confuses me. Why do developers write Custom class loaders, why not invoke a Bootstrap class loader to invoke your custom classes? What is the need to define custom class loaders? Why there are so many varieties of class loaders? eg: Bootsrap, Comman, Catalina class loader etc., Thanks in advance. I found the following, valid reasons to

I'm concerned about the security of Java executables. They offer little protection against decompilation. With tools like Java Decompiler even a kid can decompile the class files to get the original code. Apart from code obfuscation what can be done to protect a class file? Is the Encrypted Class Loader still a myth? Riduidel In a previous company we had such questions, mainly driven by management paranoia. First of all, you have to understand that absolute security is only a myth: As long as your program is run on untrusted hardware, it can be decompiled, no matter what language you use. The