dynamic-class-loaders

问题 (Yes, this is hacky and probably not best practice, but it is the least bulky solution) I have a project that involves several jars - a runnable launcher, a server, a wrapper for the server, and plugins for the server. The launcher runs the wrapper by starting a new unconnected process, a child process, or just by instantiating it, depending on config. This should be unimportant with regards to the issue. The wrapper uses URLClassLoader to load the server jar and start it, which works fine.

问题 Main goal is to override Android system class (Activity, View etc) with my own implementation. http://android-developers.blogspot.com/2011/07/custom-class-loading-in-dalvik.html ClassLoader for custom class loading is implemented, loading non-system class (custom class) works. But when I try to load Activity with my implementation - it doesn't load, because ClassLoader already has this class in its cache: /** * Returns the class with the specified name if it has already been loaded * by the

问题 We have a java based (jersey+grizzly) REST Server which exposes calls like foo.com/{game}/rules foo.com/{game}/players foo.com/{game}/matches There can be arbitrary number of games Each game has different implementations for rules, players, matches For historical reasons, we would want separate jars for each game implementation So there is REST Server as and when there is a call like foo.com/tennis/rules we want the REST Server to dynamically load 'tennis' jar. The jar does its operation.

问题 I'm trying to load a class from JAR represented as a byte[] array at runtime. I know two things about class to load: 1. it implements "RequiredInterface" 2. I know it's qualified name: "sample.TestJarLoadingClass" I found the solution in which I have to extend ClassLoader but it throws: Exception in thread "main" java.lang.ClassNotFoundException: sample.TestJarLoadingClass at java.lang.ClassLoader.findClass(ClassLoader.java:530) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at java

问题 I have a tricky question. My java program is doing in a loop such things: loop: read external file with compiled java class into byte[] array. create a new instance of my own classloader. setbytes from the readed file to this instance of classloader. using created classloader create a new instance of object of the class from external file. call any method of the created object. And where the problem is. When I run this program in debug mode it behaves as I expect, so if external file changed

问题 Hi I have requirement to create ,compile and load java classes run time. Using FTL i am creating java source files , and able to compile the source if there is no dynamic dependency. To elaborate with an instance, I have two java source file, one interface and its implementation class. I am able to compile the interface using java compiler api as follows String classpath=System.getProperty("java.class.path"); String testpath =classpath+";"+rootPath+"/lib/is_wls_client.jar;"+rootPath+"/rtds

问题 Using the Bukkit-API I'm currently trying to create a plugin which can compile java code of a given pastebin link at runtime and execute that code. Everything is working so far except for one thing: I'm getting a ClassNotFoundException when I'm trying to access one of the already loaded plugins. (I'm not getting an exception when I'm using Bukkit-API methods!) All plugin jars have been added to the classpath; it currently looks like this: /home/cubepanel/test-network/jars/craftcubbit.jar:

问题 Let us say I have a java project where I have added 2 different jars in my classpath. Java classloader found some duplicate classes in the 2 jar and then only one among them will be loaded. How does classloader decide that 2 classes in the classpath are same ? Just by class Name or packageName.className Or it compares each byte code of those classes ? 回答1: It decides just by fully-qualified name (package + class name), and it loads (in general - depends on classloader), the first class found

问题 I'm building a server in java that can receive java source files, and it should dynamically compile it using JavaCompiler and then load the class. However the problem is that if the server receive a file with the same name but different content, it will still load the previous class and gave the same outputs. I've noticed some answers suggesting creating a superclass for the class I'm trying to load and using a different classLoader, but is it still the case if the java source file is

问题 So I've got some code - I'd like to compile the string 'temp' then execute it, then change the string, recompile and execute. Problem is that currently it's just executing the first bit of code first. I expect: This is in another java file How about now? And I get: This is in another java file This is in another java file Full code follows, any help appreciated. import java.io.IOException; import java.util.Arrays; import javax.tools.DiagnosticCollector; import javax.tools.JavaCompiler; import