我从单个.class创建了一个jar,我在清单中提到了Premain-class,jar是按预期生成的,但是当我尝试运行一个使用该jar类的程序时,我收到一个错误
manifest.MD
Premain-Class : Agent
agent.Java
import java.lang.instrument.Instrumentation;
public class Agent{
private static Instrumentation inst;
public static void premain(String paramString, Instrumentation paramInstrumentation)
{
inst = paramInstrumentation;
}
public static long size(Object paramObject)
{
return inst.getObjectSize(paramObject);
}
}
test.Java
public class Test {
public static void main (String[] args){
System.out.println(Agent.size(Integer.valueOf(9)));
}
}
当我获得Agent.class时,在MANIFEST.MD文件所在的同一文件夹中,我执行以下命令
jar -cvfm agent.jar MANIFEST.MF *.class
当我得到jar时,我在编译后运行Test,如下所示
java -javaagent:agent.jar Test
我收到以下错误
Failed to find Premain-Class manifest attribute in agent.jar
Error occurred during initialization of VM
agent library failed to init: instrument
我错过了什么吗?提前致谢
MANIFEST
规范似乎不允许在键之后使用空格,而是仅在值之前。
header: alphanum *headerchar ":" SPACE *otherchar newline
*continuation
所以这
Premain-Class : Agent
应该成为
Premain-Class: Agent
另外,将Agent
放在包装下,不要使用默认包装
Premain-Class: your.package.Agent