我的一个Tomcat服务器上部署的应用程序一直出现内存不足错误,并在报错后关闭了Tomcat。
我查看了日志文件,发现如下信息:
SEVERE: Error allocating socket processor
java.lang.OutOfMemoryError: unable to create new native thread
at java.lang.Thread.start0(Native Method)
at java.lang.Thread.start(Thread.java:597)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.start(JIoEndpoint.java:513)
at org.apache.tomcat.util.net.JIoEndpoint.newWorkerThread(JIoEndpoint.java:744)
at org.apache.tomcat.util.net.JIoEndpoint.createWorkerThread(JIoEndpoint.java:723)
at org.apache.tomcat.util.net.JIoEndpoint.getWorkerThread(JIoEndpoint.java:757)
at org.apache.tomcat.util.net.JIoEndpoint.processSocket(JIoEndpoint.java:789)
at org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run(JIoEndpoint.java:355)
at java.lang.Thread.run(Thread.java:619)
18 Feb, 2015 5:43:30 PM org.apache.tomcat.util.net.JIoEndpoint createWorkerThread
INFO: Maximum number of threads (750) created for connector with address null and port 80
我正在使用这个连接器设置在server.xml文件中
<Connector port="80" protocol="HTTP/1.1"
connectionTimeout="10000" maxThreads="750" minSpareThreads="50" redirectPort="8443" />
有人能建议我该做什么吗?
线程转储
"http-80-123" daemon prio=6 tid=0x5f5e7400 nid=0xcfc runnable [0x619be000..0x619bf9e8]
java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at com.microsoft.sqlserver.jdbc.DBComms.receive(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.doExecutePreparedStatement(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement$PreparedStatementExecutionRequest.executeStatement(Unknown Source)
at com.microsoft.sqlserver.jdbc.CancelableRequest.execute(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.executeRequest(Unknown Source)
- locked <0x15c69398> (a com.microsoft.sqlserver.jdbc.TDSWriter)
我已经在20秒的时间内进行了4次线程转储,并发现这个tid始终保持活动状态
我们可以从这个转储中找到一些有用的信息吗?
我从线程转储中得到了这个信息,是否表示死锁条件"BLOCKED",因为我多次以相同的状态收到了80-90个提示。
"http-80-342" daemon prio=6 tid=0x5c0d7c00 nid=0x1d0c waiting for monitor entry [0x6ee0e000..0x6ee0fce8]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at java.sql.DriverManager.getCallerClass(DriverManager.java:477)
at java.sql.DriverManager.getConnection(DriverManager.java:576)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at t4u.common.DBConnection.getConnectionToDB(DBConnection.java:32)
at t4u.functions.CommonFunctions.getProcessID(CommonFunctions.java:1465)