I'm seeing several occurrences of deadlocks in Tomcat like the
following. Any clues? Definition of the Resource is below.
Found one Java-level deadlock:
=============================
"http-8081-56":
waiting to lock monitor 0x08f50bd0 (object 0x560511f8, a
org.apache.tomcat.dbcp.pool.impl.GenericObjectPool),
which is held by "Timer-0"
"Timer-0":
waiting to lock monitor 0x08f9cea4 (object 0x5669f358, a
org.apache.tomcat.dbcp.dbcp.PoolableConnection),
which is held by "pool-3580-thread-5"
"pool-3580-thread-5":
waiting to lock monitor 0x08f50bd0 (object 0x560511f8, a
org.apache.tomcat.dbcp.pool.impl.GenericObjectPool),
which is held by "Timer-0"
Java stack information for the threads listed above:
===================================================
"http-8081-56":
at
org.apache.tomcat.dbcp.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:916)
- waiting to lock <0x560511f8> (a
org.apache.tomcat.dbcp.pool.impl.GenericObjectPool)
at
org.apache.tomcat.dbcp.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:96)
at
org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
at com.csc.mm.db.DBUtil.getDBConnection(DBUtil.java:89)
(truncated - application code)
"Timer-0":
at
org.apache.tomcat.dbcp.dbcp.AbandonedTrace.addTrace(AbandonedTrace.java:175)
- waiting to lock <0x5669f358> (a
org.apache.tomcat.dbcp.dbcp.PoolableConnection)
at
org.apache.tomcat.dbcp.dbcp.AbandonedTrace.init(AbandonedTrace.java:92)
at
org.apache.tomcat.dbcp.dbcp.AbandonedTrace.<init>(AbandonedTrace.java:82)
at
org.apache.tomcat.dbcp.dbcp.DelegatingStatement.<init>(DelegatingStatement.java:61)
at
org.apache.tomcat.dbcp.dbcp.DelegatingConnection.createStatement(DelegatingConnection.java:224)
at
org.apache.tomcat.dbcp.dbcp.PoolableConnectionFactory.validateConnection(PoolableConnectionFactory.java:331)
at
org.apache.tomcat.dbcp.dbcp.PoolableConnectionFactory.validateObject(PoolableConnectionFactory.java:312)
at
org.apache.tomcat.dbcp.pool.impl.GenericObjectPool.evict(GenericObjectPool.java:1217)
- locked <0x560511f8> (a
org.apache.tomcat.dbcp.pool.impl.GenericObjectPool)
at
org.apache.tomcat.dbcp.pool.impl.GenericObjectPool$Evictor.run(GenericObjectPool.java:1341)
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source)
"pool-3580-thread-5":
at
org.apache.tomcat.dbcp.pool.impl.GenericObjectPool.addObjectToPool(GenericObjectPool.java:1136)
- waiting to lock <0x560511f8> (a
org.apache.tomcat.dbcp.pool.impl.GenericObjectPool)
at
org.apache.tomcat.dbcp.pool.impl.GenericObjectPool.returnObject(GenericObjectPool.java:1076)
at
org.apache.tomcat.dbcp.dbcp.PoolableConnection.close(PoolableConnection.java:87)
- locked <0x5669f358> (a
org.apache.tomcat.dbcp.dbcp.PoolableConnection)
at
org.apache.tomcat.dbcp.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.close(PoolingDataSource.java:181)
at com.csc.mm.db.DBUtil.executeQuery(DBUtil.java:408)
(truncated - application code)
<Resource name="jdbc/main"
url="jdbc:mysql://blahblah/blahblah?profileSQL=false&zeroDateTimeBehavior=convertToNull"
username="ddddddd"
password="dddddd"
auth="Container"
type="javax.sql.DataSource"
initialSize="0"
minIdle="0"
removeAbandoned="false"
removeAbandonedTimeout="60"
logAbandoned="true"
maxActive="150"
maxIdle="100"
maxWait="10000"
poolPreparedStatements="true"
driverClassName="com.mysql.jdbc.Driver"
validationQuery="select * from operator limit 1"
testWhileIdle="true"
testOnBorrow="false"
testOnReturn="false"
timeBetweenEvictionRunsMillis="10000"
numTestsPerEvictionRun="100"
minEvictableIdleTimeMillis="600000"
/>
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