完全锁定Java进程

这令人莫名其妙.突然之间,我们开始遇到Java进程中所有线程都达到BLOCKED状态并且该进程完全冻结的情况.没有jvm.log或hs * .log文件指向正在发生的事情.

一个jstack转储列出了许多线程,所有线程都处于BLOCKED状态,其中有些像这样令人困惑：

Thread 14766: (state = BLOCKED)
- java.lang.String.substring(int, int) @bci=62, line=1939 (Compiled frame)
- java.util.Formatter.parse(java.lang.String) @bci=73, line=2469 (Compiled frame)
- java.util.Formatter.format(java.util.Locale, java.lang.String, java.lang.Object[]) @bci=213, line=2438 (Compiled frame)
- java.util.Formatter.format(java.lang.String, java.lang.Object[]) @bci=7, line=2367 (Compiled frame)
- java.lang.String.format(java.lang.String, java.lang.Object[]) @bci=9, line=2769 (Compiled frame)

(裁剪其余部分)

或这个：

Thread 14794: (state = BLOCKED)
- java.lang.Throwable.toString() @bci=17, line=344 (Interpreted frame)
- java.lang.String.valueOf(java.lang.Object) @bci=10, line=2826 (Compiled frame)
- java.io.PrintWriter.println(java.lang.Object) @bci=1, line=710 (Interpreted frame)
- java.lang.Throwable.printStackTrace(java.io.PrintWriter) @bci=6, line=509 (Compiled frame)
- org.apache.log4j.DefaultThrowableRenderer.render(java.lang.Throwable) @bci=19, line=60 (Compiled frame)
- org.apache.log4j.spi.ThrowableInformation.getThrowableStrRep() @bci=50, line=87 (Interpreted frame)
- org.apache.log4j.spi.LoggingEvent.getThrowableStrRep() @bci=13, line=413 (Compiled frame)
- org.apache.log4j.WriterAppender.subAppend(org.apache.log4j.spi.LoggingEvent) @bci=26, line=313 (Compiled frame)
- org.apache.log4j.RollingFileAppender.subAppend(org.apache.log4j.spi.LoggingEvent) @bci=2, line=276 (Interpreted frame)
- org.apache.log4j.WriterAppender.append(org.apache.log4j.spi.LoggingEvent) @bci=10, line=162 (Compiled frame)
- org.apache.log4j.AppenderSkeleton.doAppend(org.apache.log4j.spi.LoggingEvent) @bci=106, line=251 (Compiled frame)
- org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(org.apache.log4j.spi.LoggingEvent) @bci=41, line=66 (Compiled frame)
- org.apache.log4j.Category.callAppenders(org.apache.log4j.spi.LoggingEvent) @bci=26, line=206 (Compiled frame)
- org.apache.log4j.Category.forcedLog(java.lang.String, org.apache.log4j.Priority, java.lang.Object, java.lang.Throwable) @bci=14, line=391 (Interpreted frame)
- org.apache.log4j.Category.error(java.lang.Object, java.lang.Throwable) @bci=37, line=322 (Interpreted frame)

(裁剪其余部分)

我必须承认,尽管我尝试在线查找原因,但不知道从哪里开始寻找原因.

这是在jdk1.6.0_31下发生的

解决方法:

它们都被字符串操作阻塞了吗？您是否已耗尽堆perm生成空间(对挂起进程执行’jstat -gc’)

标签：java,lockup
来源： https://codeday.me/bug/20191201/2081462.html