This test frequently waits forever waiting for a response. The jstack output follows:
2009-10-13 09:59:33
Full thread dump Java HotSpot(TM) 64-Bit Server VM (14.1-b02-90 mixed mode):

"Attach Listener" daemon prio=9 tid=0x00000001022f4800 nid=0x1150c6000 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE

"SocketAcceptorIoProcessor-2.0" prio=5 tid=0x000000011316f000 nid=0x115487000 runnable [0x0000000115486000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method)
at sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:136)
at sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:69)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)

• locked <0x00000001064d86b8> (a sun.nio.ch.Util$1)
• locked <0x00000001064d86a0> (a java.util.Collections$UnmodifiableSet)
• locked <0x00000001064d8340> (a sun.nio.ch.KQueueSelectorImpl)
  at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
  at org.apache.mina.transport.socket.nio.SocketIoProcessor$Worker.run(SocketIoProcessor.java:480)
  at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:51)
  at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
  at java.lang.Thread.run(Thread.java:637)

"SocketAcceptor-2" prio=5 tid=0x0000000102196800 nid=0x114e4e000 runnable [0x0000000114e4d000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.KQueueArrayWrapper.kevent0(Native Method)
at sun.nio.ch.KQueueArrayWrapper.poll(KQueueArrayWrapper.java:136)
at sun.nio.ch.KQueueSelectorImpl.doSelect(KQueueSelectorImpl.java:69)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)

• locked <0x0000000107ad72c0> (a sun.nio.ch.Util$1)
• locked <0x0000000107ad72d8> (a java.util.Collections$UnmodifiableSet)
• locked <0x0000000107aee2b8> (a sun.nio.ch.KQueueSelectorImpl)
  at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
  at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:84)
  at org.apache.mina.transport.socket.nio.SocketAcceptor$Worker.run(SocketAcceptor.java:220)
  at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:51)
  at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
  at java.lang.Thread.run(Thread.java:637)

"HSQLDB Timer @e8ae59a" daemon prio=5 tid=0x0000000113421800 nid=0x114fc3000 in Object.wait() [0x0000000114fc2000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(Native Method)

• waiting on <0x00000001072e8c08> (a org.hsqldb.lib.HsqlTimer)
  at org.hsqldb.lib.HsqlTimer.nextTask(Unknown Source)
• locked <0x00000001072e8c08> (a org.hsqldb.lib.HsqlTimer)
  at org.hsqldb.lib.HsqlTimer$TaskRunner.run(Unknown Source)
  at java.lang.Thread.run(Thread.java:637)

"Thread-5" prio=5 tid=0x00000001023ac800 nid=0x114b1b000 runnable [0x0000000114b1a000]
java.lang.Thread.State: RUNNABLE
at java.net.PlainDatagramSocketImpl.receive0(Native Method)

• locked <0x00000001071a3c58> (a java.net.PlainDatagramSocketImpl)
  at java.net.PlainDatagramSocketImpl.receive(PlainDatagramSocketImpl.java:136)
• locked <0x00000001071a3c58> (a java.net.PlainDatagramSocketImpl)
  at java.net.DatagramSocket.receive(DatagramSocket.java:712)
• locked <0x00000001071c6cd8> (a java.net.DatagramPacket)
• locked <0x0000000107195e18> (a java.net.DatagramSocket)
  at ch.qos.logback.classic.net.mock.MockSyslogServer.run(MockSyslogServer.java:50)

"Thread-4" prio=5 tid=0x000000011321f800 nid=0x114a18000 runnable [0x0000000114a17000]
java.lang.Thread.State: RUNNABLE
at java.net.PlainDatagramSocketImpl.receive0(Native Method)

• locked <0x00000001071a3cb0> (a java.net.PlainDatagramSocketImpl)
  at java.net.PlainDatagramSocketImpl.receive(PlainDatagramSocketImpl.java:136)
• locked <0x00000001071a3cb0> (a java.net.PlainDatagramSocketImpl)
  at java.net.DatagramSocket.receive(DatagramSocket.java:712)
• locked <0x00000001071c6d08> (a java.net.DatagramPacket)
• locked <0x0000000107195e50> (a java.net.DatagramSocket)
  at ch.qos.logback.classic.net.mock.MockSyslogServer.run(MockSyslogServer.java:50)

"Thread-3" prio=5 tid=0x000000010241d800 nid=0x114915000 runnable [0x0000000114914000]
java.lang.Thread.State: RUNNABLE
at java.net.PlainDatagramSocketImpl.receive0(Native Method)

• locked <0x0000000107104030> (a java.net.PlainDatagramSocketImpl)
  at java.net.PlainDatagramSocketImpl.receive(PlainDatagramSocketImpl.java:136)
• locked <0x0000000107104030> (a java.net.PlainDatagramSocketImpl)
  at java.net.DatagramSocket.receive(DatagramSocket.java:712)
• locked <0x0000000107125850> (a java.net.DatagramPacket)
• locked <0x00000001071243f8> (a java.net.DatagramSocket)
  at ch.qos.logback.classic.net.mock.MockSyslogServer.run(MockSyslogServer.java:50)

"Thread-1" prio=5 tid=0x000000011316c000 nid=0x114703000 runnable [0x0000000114702000]
java.lang.Thread.State: RUNNABLE
at java.net.PlainDatagramSocketImpl.receive0(Native Method)

• locked <0x0000000107077898> (a java.net.PlainDatagramSocketImpl)
  at java.net.PlainDatagramSocketImpl.receive(PlainDatagramSocketImpl.java:136)
• locked <0x0000000107077898> (a java.net.PlainDatagramSocketImpl)
  at java.net.DatagramSocket.receive(DatagramSocket.java:712)
• locked <0x00000001070e9668> (a java.net.DatagramPacket)
• locked <0x00000001070f1b20> (a java.net.DatagramSocket)
  at ch.qos.logback.classic.net.mock.MockSyslogServer.run(MockSyslogServer.java:50)

"Thread-0" prio=5 tid=0x0000000113113000 nid=0x1145ed000 runnable [0x00000001145ec000]
java.lang.Thread.State: RUNNABLE
at java.net.PlainDatagramSocketImpl.receive0(Native Method)

• locked <0x00000001070778f0> (a java.net.PlainDatagramSocketImpl)
  at java.net.PlainDatagramSocketImpl.receive(PlainDatagramSocketImpl.java:136)
• locked <0x00000001070778f0> (a java.net.PlainDatagramSocketImpl)
  at java.net.DatagramSocket.receive(DatagramSocket.java:712)
• locked <0x00000001070e9698> (a java.net.DatagramPacket)
• locked <0x00000001070f1b58> (a java.net.DatagramSocket)
  at ch.qos.logback.classic.net.mock.MockSyslogServer.run(MockSyslogServer.java:50)

"Low Memory Detector" daemon prio=5 tid=0x000000010208e000 nid=0x114290000 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE

"CompilerThread1" daemon prio=9 tid=0x000000010208d800 nid=0x11418d000 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE

"CompilerThread0" daemon prio=9 tid=0x000000010208c800 nid=0x11408a000 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE

"Signal Dispatcher" daemon prio=9 tid=0x000000010208c000 nid=0x113f87000 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE

"Surrogate Locker Thread (CMS)" daemon prio=5 tid=0x000000010208b000 nid=0x113e84000 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE

"Finalizer" daemon prio=8 tid=0x0000000102075800 nid=0x113b07000 in Object.wait() [0x0000000113b06000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)

• waiting on <0x0000000106ef0848> (a java.lang.ref.ReferenceQueue$Lock)
  at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
• locked <0x0000000106ef0848> (a java.lang.ref.ReferenceQueue$Lock)
  at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134)
  at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)

"Reference Handler" daemon prio=10 tid=0x0000000113026000 nid=0x113a04000 in Object.wait() [0x0000000113a03000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)

• waiting on <0x0000000106ef0860> (a java.lang.ref.Reference$Lock)
  at java.lang.Object.wait(Object.java:485)
  at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)
• locked <0x0000000106ef0860> (a java.lang.ref.Reference$Lock)

"main" prio=5 tid=0x0000000102000800 nid=0x101301000 runnable [0x00000001012fe000]
java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at com.sun.mail.util.TraceInputStream.read(TraceInputStream.java:97)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
at java.io.BufferedInputStream.read(BufferedInputStream.java:237)

• locked <0x0000000106458610> (a java.io.BufferedInputStream)
  at com.sun.mail.util.LineInputStream.readLine(LineInputStream.java:75)
  at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:1440)
  at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:1376)
  at com.sun.mail.smtp.SMTPTransport.finishData(SMTPTransport.java:1215)
  at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:586)
• locked <0x0000000106454d10> (a com.sun.mail.smtp.SMTPTransport)
  at javax.mail.Transport.send0(Transport.java:169)
  at javax.mail.Transport.send(Transport.java:98)
  at ch.qos.logback.core.net.SMTPAppenderBase.sendBuffer(SMTPAppenderBase.java:282)
  at ch.qos.logback.core.net.SMTPAppenderBase.append(SMTPAppenderBase.java:153)
  at ch.qos.logback.core.AppenderBase.doAppend(AppenderBase.java:91)
• locked <0x000000010710e350> (a ch.qos.logback.classic.net.SMTPAppender)
  at ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:64)
  at ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:276)
  at ch.qos.logback.classic.Logger.callAppenders(Logger.java:263)
  at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:445)
  at ch.qos.logback.classic.Logger.filterAndLog_0_Or3Plus(Logger.java:399)
  at ch.qos.logback.classic.Logger.error(Logger.java:562)
  at ch.qos.logback.classic.net.SMTPAppender_SubethaSMTPTest.htmlLong(SMTPAppender_SubethaSMTPTest.java:195)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  at java.lang.reflect.Method.invoke(Method.java:597)
  at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:59)
  at org.junit.internal.runners.MethodRoadie.runTestMethod(MethodRoadie.java:98)
  at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:79)
  at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:87)
  at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:77)
  at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:42)
  at org.junit.internal.runners.JUnit4ClassRunner.invokeTestMethod(JUnit4ClassRunner.java:88)
  at org.junit.internal.runners.JUnit4ClassRunner.runMethods(JUnit4ClassRunner.java:51)
  at org.junit.internal.runners.JUnit4ClassRunner$1.run(JUnit4ClassRunner.java:44)
  at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:27)
  at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:37)
  at org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:42)
  at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:62)
  at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:140)
  at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:127)
  at org.apache.maven.surefire.Surefire.run(Surefire.java:177)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  at java.lang.reflect.Method.invoke(Method.java:597)
  at org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:338)
  at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:997)

"VM Thread" prio=9 tid=0x0000000102070000 nid=0x113901000 runnable

"Gang worker#0 (Parallel GC Threads)" prio=9 tid=0x0000000102002000 nid=0x105902000 runnable

"Gang worker#1 (Parallel GC Threads)" prio=9 tid=0x0000000102002800 nid=0x105a05000 runnable

"Concurrent Mark-Sweep GC Thread" prio=9 tid=0x0000000102042000 nid=0x112d9f000 runnable
"VM Periodic Task Thread" prio=10 tid=0x000000010208f000 nid=0x114393000 waiting on condition

"Exception Catcher Thread" prio=10 tid=0x0000000102001800 nid=0x101701000 runnable
JNI global references: 939