Using the attachment arithmetictest.java do the following:
1. jdb ArithmeticTest
Initializing jdb...
0xee2f21a8:class(ArithmeticTest)
2. stop at ArithmeticTest:15
Breakpoint set at ArithmeticTest:15
3. run
run ArithmeticTest
x is 6, y is 4
running ...
main[1] x + y = 10
x - y = 2
x / y = 1
x % y = 2
a is 12.5, b is 7.0

Breakpoint hit: ArithmeticTest.main (ArithmeticTest:15)
main[1]
4. run
run ArithmeticTest
x is 6, y is 4
x + y = 10
x - y = 2
x / y = 1
x % y = 2
a is 12.5, b is 7.0

Breakpoint hit:
5. run (we hang here)

Full thread dump:
    "Agent input" (TID:0xee300f08, sys_thread_t:0xbc1c0, state:MW) prio=10
        at sun.tools.debug.RemoteAgent.dumpStack(RemoteAgent.java:550)
        at sun.tools.debug.RemoteThread.getStack(RemoteThread.java:280)
        at sun.tools.debug.RemoteThread.dumpStack(RemoteThread.java:131)
        at sun.tools.ttydebug.TTY.breakpointEvent(TTY.java:82)
        at sun.tools.debug.AgentIn.run(AgentIn.java:62)
        at java.lang.Thread.run(Thread.java:472)
    "output reader" (TID:0xee301888, sys_thread_t:0x1054d8, state:CW) prio=9
        at java.lang.Object.wait(Native Method)
        at java.io.PipedInputStream.read(PipedInputStream.java:195)
        at java.lang.ProcessInputStream.read(UNIXProcess.java:314)
        at java.io.PipedInputStream.read(PipedInputStream.java:236)
        at java.io.InputStream.read(InputStream.java:74)
        at java.io.InputStreamReader.fill(InputStreamReader.java:159)
        at java.io.InputStreamReader.read(InputStreamReader.java:229)
        at java.io.BufferedReader.fill(BufferedReader.java:138)
        at java.io.BufferedReader.readLine(BufferedReader.java:226)
        at sun.tools.debug.RemoteAgent$1.run(RemoteAgent.java:109)
    "stderr reader pid=28103" (TID:0xee301a68, sys_thread_t:0xf96e8, state:CW) prio=5
        at java.io.FileInputStream.readBytes(Native Method)
        at java.io.FileInputStream.read(FileInputStream.java:142)
        at java.lang.ProcessInputStream.run(UNIXProcess.java:349)
        at java.lang.Thread.run(Thread.java:472)
    "stdout reader pid=28103" (TID:0xee3017f0, sys_thread_t:0xfba00, state:CW) prio=5
        at java.io.FileInputStream.readBytes(Native Method)
        at java.io.FileInputStream.read(FileInputStream.java:142)
        at java.lang.ProcessInputStream.run(UNIXProcess.java:349)
        at java.lang.Thread.run(Thread.java:472)
    "process reaper" (TID:0xee3018f0, sys_thread_t:0xfb7d0, state:CW) prio=5
        at java.lang.UNIXProcess.run(Native Method)
        at java.lang.Thread.run(Thread.java:472)
    "Finalizer" (TID:0xee300378, sys_thread_t:0xad110, state:CW) prio=8
        at java.lang.Object.wait(Native Method)
        at java.lang.Ref$Queue.remove(Ref.java:232)
        at java.lang.Ref$Queue.remove(Ref.java:245)
        at java.lang.Finalizer$FinalizerThread.run(Finalizer.java:130)
    "Ref handler" (TID:0xee300428, sys_thread_t:0xaa398, state:CW) prio=10
        at java.lang.Object.wait(Native Method)
        at java.lang.Object.wait(Object.java:309)
        at java.lang.Ref$RefHandler.run(Ref.java:269)
    "Async Garbage Collector" (TID:0xee3001f0, sys_thread_t:0x940e8, state:CW) prio=1
    "Idle thread" (TID:0xee300238, sys_thread_t:0xa2b10, state:R) prio=0 *current thread*
    "Clock" (TID:0xee300088, sys_thread_t:0xa2a08, state:CW) prio=12
    "main" (TID:0xee3000b0, sys_thread_t:0x20a60, state:CW) prio=10
        at java.net.SocketInputStream.socketRead(Native Method)
        at java.net.SocketInputStream.read(SocketInputStream.java:90)
        at java.io.BufferedInputStream.fill(BufferedInputStream.java:129)
        at java.io.BufferedInputStream.read(BufferedInputStream.java:156)
        at java.io.DataInputStream.readInt(DataInputStream.java:360)
        at sun.tools.debug.RemoteAgent.getReply(RemoteAgent.java:413)
        at sun.tools.debug.RemoteAgent.run(RemoteAgent.java:743)
        at sun.tools.debug.RemoteDebugger.run(RemoteDebugger.java:216)
        at sun.tools.ttydebug.TTY.run(TTY.java:301)
        at sun.tools.ttydebug.TTY.executeCommand(TTY.java:1361)
        at sun.tools.ttydebug.TTY.<init>(TTY.java:1463)
        at sun.tools.ttydebug.TTY.main(TTY.java:1584)
Monitor Cache Dump:
    sun.tools.debug.RemoteThread@EE304DB8/EE379228: owner "Agent input" (0xbc1c0, 1 entry)
    java.io.DataOutputStream@EE300FE8/EE370120: owner "main" (0x20a60, 1 entry)
        Waiting to enter:
            "Agent input"
    java.io.InputStreamReader@EE3019D0/EE367580: owner "output reader" (0x1054d8, 1 entry)
    java.io.BufferedInputStream@EE300F50/EE36EF80: owner "main" (0x20a60, 1 entry)
Registered Monitor Dump:
    utf8 hash table: <unowned>
    JNI pinning lock: <unowned>
    JNI global reference lock: <unowned>
    BinClass lock: <unowned>
    Class linking lock: <unowned>
    Code rewrite lock: <unowned>
    Heap lock: <unowned>
    Monitor IO lock: <unowned>
    Child death monitor: <unowned>
        Waiting to be notified:
            "process reaper"
    Event monitor: <unowned>
    I/O monitor: <unowned>
    Alarm monitor: <unowned>
        Waiting to be notified:
            "Clock"
    Sbrk lock: <unowned>
    Monitor cache expansion lock: <unowned>
    Thread queue lock: <unowned>
    Monitor registry: owner "Idle thread" (0xa2b10, 1 entry)
Thread Alarm Q:
    sys_thread_t 0x1054d8 [Timeout in 512 ms]
    sys_thread_t 0x940e8 [Timeout in 542 ms]