classloader

问题 I want to have a list of all the classes that are loaded within multiple threads/JVM's at a certain moment in time. I know that when you run java with the -verbose parameter, you can write it to a file as something like this: java -verbose:class com.package.Foo > classes-used.txt However, I have threads in my main program that use a shell script to start a new jar. I would like to avoid to have to write the -verbose parameter in every shell script and I'm wondering if there is any other way

问题 I want to make a command-line utility that does some operations based on reflection of external class files. I would pass in a path to .class files or source files(possibly wildcards). At some point during the execution, I need to get Class objects for each class, not knowing their package names beforehand. What would it take to do this? What can I look at to get started? I also have access to the classes' source files. this is in java 1.6. also, would it be easier to get class objects from

问题 Say I have the following two classes: public class MyClass { public String getDescription() { return "MyClass"; } } and public class MyClassLoader { public static void main (String[] argv) throws ClassNotFoundException { Class.forName("MyClass"); System.out.println("MyClass class was successfully loaded"); } } If both of these classes are in the default package, it runs fine, the class loads, and the world is beautiful. (If I were to delete the class MyClass , I would get a

问题 Assume I have: <bean id="a1_beanId" class="com.rudziankou.MyUnusedClass" lazy-init="true" > </bean> I have never use this bean during app run. Questions: Will com.rudziankou.MyUnusedClass be loaded by Class Loader ? Do we have access to change default spring class loading behavior? 来源： https://stackoverflow.com/questions/38694980/spring-is-lazy-initialization-preventing-class-to-be-loaded

问题 I have an enterprise application A and B deployed (in WLS 10.0). A is the "framework", B is a client app. The client issues the following calls: Object o = ctx.lookup(jndiName); // line 1 cf = (ConnectionFactory) o; // line 2 ConnectionFactory is an interface, defined as: public interface ConnectionFactory extends java.io.Serializable, javax.resource.Referenceable { ... } What happens is: If the jar containing the interface class is on the system classpath, line 2 is executed fine If the

问题 I have an ObjectInputStream and want to load classes with a custom ClassLoader . Thus is created a subclass of ObjectInputStream that overrides the resolveClass() function. Now my problem is that i want to change the ClassLoader during execution. But sometimes resolveClass() does not seem to be executed when I do readObject() on this stream. Then the class is loaded with the wrong ClassLoader . Any idea why resolveClass() is not executed and how to solve this issue? 回答1: resolveClass() will

问题 I'm creating an MVC Spring webapp. Using: Jetty (servlet container), DataNucleus (dao platform), DB4O (embedded datastore). When I persist an object (done from within a Spring Controller) using JDO from DataNucleus, it stores to the DB fine. @PersistenceCapable public class Test { @Persistent private String testString; //getter-setters implemented } When I do a simple query for the objects I previously added I get a ClassCastException on my Test class (can't cast a.b.c.Test to a.b.c.Test ).

问题 I have a Groovy library made available as a Global shared library: package com.example @Grab(group="org.apache.httpcomponents", module="httpclient", version="[4.5.3,)") import org.apache.http.HttpHost import org.apache.http.impl.client.HttpClients class MyClass implements Serializable { static def run() { return HttpClients.custom() .setProxy(new HttpHost("proxy.example.com", 3128)) .build() } static def debug() { return (""" this: ${this.classLoader.class.toString()} ${this.classLoader

问题 I have the following problem: I want to send a type (java.lang.Class) over the wire and 'define' the class on the other side. I tried like that: ByteArrayOutputStream bos = new ByteArrayOutputStream(); ObjectOutputStream oos = new ObjectOutputStream(bos); oos.writeObject(MyClass.class); and on the receiving end: ByteArrayInputStream bis = new ByteArrayInputStream(request.getBytes()); ObjectInputStream ois = new ObjectInputStream(bis); Class c = (Class) ois.readObject(); //

问题 If i have a custom classloader which, instead of delegating to its parent first, tries a search and load of the class itself will it be a violation of some stated/unstated rule? 回答1: The Tomcat webapp classloader follows this model, so I imagine it works to at least some extent :) From the Tomcat classloader documentation: As mentioned above, the web application class loader diverges from the default Java 2 delegation model (in accordance with the recommendations in the Servlet Specification,