org.postgresql.core.QueryExecutor.execute not responding (Deadlock ?)

I used postgres 7.2.3 and pg72jdbc2.jar as my jdbc driver on my production
server (java 1.4.2_02, jakarta-tomcat-4.1.24, Redhat Linux 8.0). The jdbc seem
to having problems when the postgresql server was
buzy. The org.postgresql.core.QueryExecutor.execute stuck when doing updating
process for a query. This caused all my other threads that waiting for execute
a query hang because waiting for releasing of the lock on
postgresql.core.QueryExecutor.execute. I have attacted the thread dump from my
server. I suspected that the postgresql having deadlock on the server site but
however i cannot confirm about that. Does postgresql having capability of
detection for deadlock ? Or, it was bugs for the jdbc driver ?

"Thread-39" daemon prio=1 tid=0x08646590 nid=0x666d runnable [5beb7000..5beb88b8]
    at java.net.SocketInputStream.socketRead0(Native Method)
    at java.net.SocketInputStream.read(SocketInputStream.java:129)
    at java.io.BufferedInputStream.fill(BufferedInputStream.java:183)
    at java.io.BufferedInputStream.read(BufferedInputStream.java:201)
    - locked <0x47bfb940> (a java.io.BufferedInputStream)
    at org.postgresql.PG_Stream.ReceiveChar(PG_Stream.java:141)
    at org.postgresql.core.QueryExecutor.execute(QueryExecutor.java:68)
    - locked <0x47bfb758> (a org.postgresql.PG_Stream)
    at org.postgresql.Connection.ExecSQL(Connection.java:398)
    at org.postgresql.jdbc2.Statement.execute(Statement.java:130)
    at org.postgresql.jdbc2.Statement.executeUpdate(Statement.java:73)
    at com.ebusinessoft.gen.sys.AutoNumber.nextNumber(AutoNumber.java:79)
    at org.apache.jsp.processpax_jsp._jspService(processpax_jsp.java:832)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
    at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:210)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
    at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
    at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
    at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
    at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
    at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
    at
org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
    at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
    at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
    at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
    at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
    at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
    at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
    at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
    at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
    at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:594)
    at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:392)
    at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
    at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:619)
    at java.lang.Thread.run(Thread.java:534)