当我尝试运行 java 程序 (java -javaagent:size.jar ObjectSizeTest
) 时,出现以下错误:
Failed to load Premain-Class manifest attribute from D:\workspace\ObjectSizeTest\size.jar
Error occurred during initialization of VM
agent library failed to init: instrument
这是 ObjectSizeTest 的代码:
public class ObjectSizeTest {
public static void main(String[] args) {
String s = new String("sai");
System.out.println(ObjectSizeFetcher.getObjectSize(s));
}
}
MANIFEST.MF(对于 size.jar):
Manifest-Version: 1.0
Created-By: 1.5.0_18 (Sun Microsystems Inc.)
Premain-Class: ObjectSizeFetcher
这是 ObjectSizeFetcher 的代码:
import java.lang.instrument.Instrumentation;
public class ObjectSizeFetcher {
private static Instrumentation instrumentation;
public static void premain(String args, Instrumentation inst) {
instrumentation = inst;
}
public static long getObjectSize(Object o) {
return instrumentation.getObjectSize(o);
}
}
最佳答案
确保您已提供包含 pre-main 方法的类的完整 java 路径。 例如像这样的 org.eclipse.anotherpckg.ObjectSizeFetcher。其次,名称前必须有一个空格,最后要有回车符。例如
Manifest-Version: 1.0
Created-By: 1.5.0_18 (Sun Microsystems Inc.)
Premain-Class: org.eclipse.package.ObjectSizeFetcher
最后一行是由于回车。
关于java - "Failed to load Premain-Class manifest attribute"尝试使用 java 代理获取对象的大小时,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/2266525/