获取lambda函数在jvm中加载的所有类的列表

Question

I'm trying to find a method to see the number of classes loaded by the JVM for a lambda function. I have a sample code from a friend but it does not work. I have the following:

java -cp my.jar -verbose:class Handler | grep Loaded 

It must be missing something because I don't have the "Loaded" classes. Is "load" the replacement of "Loaded" ?

The result of this is something like:

[0.179s][info][class,load] java.text.Format source: jrt:/java.base
[0.179s][info][class,load] java.text.MessageFormat source: jrt:/java.base
[0.179s][info][class,load] java.util.Locale$Category source: jrt:/java.base
[0.179s][info][class,load] java.util.Locale$1 source: jrt:/java.base
[0.180s][info][class,load] java.text.FieldPosition source: jrt:/java.base
[0.180s][info][class,load] java.util.Date source: jrt:/java.base

I was expecting something like:

[Opened /usr/java/j2sdk1.4.1/jre/lib/rt.jar]
[Opened /usr/java/j2sdk1.4.1/jre/lib/sunrsasign.jar]
[Opened /usr/java/j2sdk1.4.1/jre/lib/jsse.jar]
[Opened /usr/java/j2sdk1.4.1/jre/lib/jce.jar]
[Opened /usr/java/j2sdk1.4.1/jre/lib/charsets.jar]
[Loaded java.lang.Object from /usr/java/j2sdk1.4.1/jre/lib/rt.jar]
[Loaded java.io.Serializable from /usr/java/j2sdk1.4.1/jre/lib/rt.jar]
[Loaded java.lang.Comparable from /usr/java/j2sdk1.4.1/jre/lib/rt.jar]
[Loaded java.lang.CharSequence from /usr/java/j2sdk1.4.1/jre/lib/rt.jar]
[Loaded java.lang.String from /usr/java/j2sdk1.4.1/jre/lib/rt.jar]

Do you know what I'm missing ? Why I don't see the "loaded" classes ? I have Java(TM) SE Runtime Environment 18.9 (build 11.0.2+9-LTS

Thanks. CC

Answer 1

I have the answer. The expected results is on Java 8. In Java 11 the result is not the same, so I have to adapt my command for each version.

Answer 2

Please try with below Classes .Hope this works for you

java -cp my.jar -verbose:class Handler | grep 'Load*\|Open*'
java -cp my.jar -verbose:class Instrumentation | grep 'Load*\|Open*'
java -cp my.jar -verbose:class Serialisation | grep 'Load*\|Open*'