我正在尝试调试通过 JNLP 运行的 Java 客户端中的类加载问题。但是 -XX:+TraceClassLoading
只打印“Loaded”事件并且只针对核心类。另一个选项 -verbose:class
什么都不做。我尝试用 D 和 X 作为前缀,但没有效果。
当我在桌面 java 应用程序中使用 -verbose:class
时,它会打印所有事件,但错误不会出现在此处。
我是不是遗漏了什么或者是否有其他方法可以跟踪 JNLP 中的类加载?
编辑:
我尝试过的示例(这是 javaws
调用扩展成的内容):
/usr/lib/jvm/jdk1.8.0_161/jre/bin/java -classpath /usr/lib/jvm/jdk1.8.0_161/jre/lib/deploy.jar -Djava.security.policy=file:/usr/lib/jvm/jdk1.8.0_161/jre/lib/security/javaws.policy -DtrustProxy=true -verbose:class -XX:+TraceClassLoading -Xverify:remote -Djnlpx.home=/usr/lib/jvm/jdk1.8.0_161/jre/bin -Djava.security.manager -Djnlpx.origFilenameArg=http://localhost:8080/webstart.jnlp -Djnlpx.remove=false -Dsun.awt.warmup=true -Xbootclasspath/a:/usr/lib/jvm/jdk1.8.0_161/jre/lib/javaws.jar:/usr/lib/jvm/jdk1.8.0_161/jre/lib/deploy.jar:/usr/lib/jvm/jdk1.8.0_161/jre/lib/plugin.jar -Djnlpx.splashport=59367 -Djnlpx.jvm=/usr/lib/jvm/jdk1.8.0_161/jre/bin/java com.sun.javaws.Main -notWebJava http://localhost:8080/webstart.jnlp
JNLP 运行的部分输出(无用户类):
[Loaded java.lang.UNIXProcess$$Lambda$15/1173574345 from java.lang.UNIXProcess]
[Loaded com.sun.javaws.Launcher$CacheUpdateRequiredException from /usr/lib/jvm/jdk1.8.0_161/jre/lib/javaws.jar]
[Loaded java.lang.SecurityException from /usr/lib/jvm/jdk1.8.0_161/jre/lib/rt.jar]
[Loaded com.sun.deploy.security.BlockedException from /usr/lib/jvm/jdk1.8.0_161/jre/lib/deploy.jar]
[Loaded sun.awt.X11.XSystemTrayPeer from /usr/lib/jvm/jdk1.8.0_161/jre/lib/rt.jar]
桌面 java 运行的部分输出(注意 .m2 存储库中的用户类,是的,它在 _151 上运行,但没有区别,我都试过了):
[Loaded <...>.UnmodifiableArrayIterator from file:/home/imaskar/.m2/repository/<...>/1.6-SNAPSHOT/<...>-1.6-SNAPSHOT-jar-with-dependencies.jar]
[Loaded <...>.RCEvent from file:/home/imaskar/.m2/repository/<...>/1.6-SNAPSHOT/<...>-1.6-SNAPSHOT-jar-with-dependencies.jar]
[Loaded <...>.RCMessengerQualityListener$1 from file:/home/imaskar/.m2/repository/<...>/1.6-SNAPSHOT/<...>-1.6-SNAPSHOT.jar]
[Loaded javax.swing.JComponent$$Lambda$124/1794174740 from javax.swing.JComponent]
[Loaded java.util.prefs.FileSystemPreferences$10 from /usr/lib/jvm/jdk1.8.0_151/jre/lib/rt.jar]
[Loaded java.util.prefs.FileSystemPreferences$12 from /usr/lib/jvm/jdk1.8.0_151/jre/lib/rt.jar]
[Loaded java.util.prefs.FileSystemPreferences$11 from /usr/lib/jvm/jdk1.8.0_151/jre/lib/rt.jar]
编辑2:
Here建议将选项传递给 jnlp 的另一种方法,但它也只打印核心类。我想,这是因为选项只传递给第一个 java 调用,它只管理部署,然后对实际应用程序进行另一个调用。
最佳答案
解决方法
- 运行
javaws http://localhost:8080/webstart.jnlp
并稍等片刻,以便它部署并启动 - 运行
ps -ax | grep Djnlpx
并复制完全展开的 JNLP 调用 - 关闭 p1 的申请
- 将
-verbose:class
(或您想要的任何其他选项)添加到来自 p2 的调用并再次运行。
解释
我发现 javaws 调用扩展了两次。所以,基本调用是
javaws http://localhost:8080/sin-web/webstart.jnlp
如果我尝试在此处添加任何选项,则没有任何效果。 它扩展为
/usr/lib/jvm/jdk1.8.0_151/jre/bin/java
-classpath
/usr/lib/jvm/jdk1.8.0_151/jre/lib/deploy.jar
-Djava.security.policy=file:/usr/lib/jvm/jdk1.8.0_151/jre/lib/security/javaws.policy
-DtrustProxy=true
-Xverify:remote
-Djnlpx.home=/usr/lib/jvm/jdk1.8.0_151/jre/bin
-Djava.security.manager
-Djnlpx.origFilenameArg=http://localhost:8080/sin-web/webstart.jnlp
-Djnlpx.remove=false
-Dsun.awt.warmup=true
-Xbootclasspath/a:/usr/lib/jvm/jdk1.8.0_151/jre/lib/javaws.jar:/usr/lib/jvm/jdk1.8.0_151/jre/lib/deploy.jar:/usr/lib/jvm/jdk1.8.0_151/jre/lib/plugin.jar
-Djnlpx.splashport=44975
-Djnlpx.jvm=/usr/lib/jvm/jdk1.8.0_151/jre/bin/java
com.sun.javaws.Main
-verbose
-notWebJava
http://localhost:8080/sin-web/webstart.jnlp
换行符为了可读性,你必须删除它们。如果您将 -verbose:class
放在这里,它只会打印核心类。该调用扩展为:
/usr/lib/jvm/jdk1.8.0_161/jre/bin/java
-Xmx1g -Xms256m
-Djnlp.packEnabled=false
-Xbootclasspath/a:/usr/lib/jvm/jdk1.8.0_161/jre/lib/javaws.jar:/usr/lib/jvm/jdk1.8.0_161/jre/lib/deploy.jar:/usr/lib/jvm/jdk1.8.0_161/jre/lib/plugin.jar
-Djnlp.tk=awt
-classpath /usr/lib/jvm/jdk1.8.0_161/jre/lib/deploy.jar -Djnlpx.vmargs=LVhteDFnAC1YbXMyNTZtAC1Eam5scC5wYWNrRW5hYmxlZD1mYWxzZQA= -Djnlpx.jvm=/usr/lib/jvm/jdk1.8.0_161/jre/bin/java
-Djnlpx.splashport=59367
-Djnlpx.home=/usr/lib/jvm/jdk1.8.0_161/jre/bin
-Djnlpx.remove=false
-Djnlpx.offline=false
-Djnlpx.relaunch=true
-Djnlpx.session.data=/tmp/session2497443162302588696
-Djnlpx.heapsize=NULL,NULL
-Djava.security.policy=file:/usr/lib/jvm/jdk1.8.0_161/jre/lib/security/javaws.policy
-DtrustProxy=true
-Xverify:remote
-Djnlpx.origFilenameArg=http://localhost:8080/webstart.jnlp
-Dsun.awt.warmup=true
-Djava.security.manager
com.sun.javaws.Main
-notWebJava
/home/imaskar/.java/deployment/cache/6.0/1/40a358c1-677ef294
换行符再次提高可读性。如果你把 -verbose:class
放在这里,所有的类事件都会被打印出来。
关于java - JNLP 中的 JVM 类加载器跟踪选项,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/49623617/