#174 Firewall stops the startup of Dr. Java

[Anonymous]

Dr. Java (Dr. Java stable 20030313.jar) hangs up when
trying to start up under Windows XP/home. The Dr.
Java Splash screen comes up but won't go
away....Need to end the Javaw Process to terminate.
This happens both when double clicking on the Dr.
Java .jar file, and when starting from a command line.

I've found that the problem was my McAfee Firewall,
when the firewall is off, this problem goes away. When
the firewall is on, it happens.

This does not happen with an older version of Dr. Java
(no version number, size 833kb, dated 7/30/2001)

hansb@theworld.com
Using SDK 1.4.1.02

[Tim Oberg]

Logged In: YES
user_id=691516

This is indicative of another problem. Whenever any sort of
rmi stuff fails, the only indication of an error is that a
message is logged iff logging is turned on (it defaults to
off). So the only indication of any error is when the
program hangs. An UnexpectedExceptionError when this type
of failure occurs may be more appropriate. And if it
specifically happens when drjava tries to connect to address
127.0.0.1 (as is probably happening here), a message to
check firewall settings may be appropriate, at least as an
interim solution.

[Charles Reis]

Logged In: YES
user_id=429731

This issue appears to be occurring more frequently (eg.
support request 817823), so it should really be addressed.

For users with this problem:

Try downloading the copy of DrJava linked below, which has
extra debugging information enabled to help diagnose the
problem. Please post any error messages that it reports to
this bug report.
http://drjava.org/downloads/drjava-debug-reset.jar

For developers diagnosing the problem:

I've also noticed a similar problem (or perhaps it's closer
to the "Reset Failed!" problem, which might or might not be
the same) on Linux if I shut down my network interface and
try to run DrJava. This might be a fundamental problem with
using RMI, since even very old copies of DrJava crash in
this situation. It's worth thinking about a workaround,
though. Here's the error I get from the debugging build
linked above (this error is displayed from SlaveJVMRunner.java):

An error occurred while starting the slave JVM:
Couldn't instantiate and register the slave.
Also failed to display error through master JVM, because:
java.rmi.ConnectIOException: Exception creating connection
to: 127.0.0.1; nested exception is:
java.net.SocketException: Network is unreachable
at
sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:580)
at
sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:185)
at
sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:171)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:101)
at
edu.rice.cs.drjava.model.repl.newjvm.MainJVM_Stub.errorStartingSlave(Unknown
Source)
at
edu.rice.cs.util.newjvm.SlaveJVMRunner.main(SlaveJVMRunner.java:136)
Caused by: java.net.SocketException: Network is unreachable
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
at
java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
at java.net.Socket.connect(Socket.java:452)
at java.net.Socket.connect(Socket.java:402)
at java.net.Socket.<init>(Socket.java:309)
at java.net.Socket.<init>(Socket.java:124)
at
sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:22)
at
sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:128)
at
sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:562)
... 5 more

Original error:
java.rmi.ConnectIOException: Exception creating connection
to: 127.0.0.1; nested exception is:
java.net.SocketException: Network is unreachable
at
sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:580)
at
sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:185)
at
sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:171)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:101)
at
edu.rice.cs.drjava.model.repl.newjvm.MainJVM_Stub.registerSlave(Unknown
Source)
at
edu.rice.cs.util.newjvm.SlaveJVMRunner.main(SlaveJVMRunner.java:130)
Caused by: java.net.SocketException: Network is unreachable
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
at
java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
at java.net.Socket.connect(Socket.java:452)
at java.net.Socket.connect(Socket.java:402)
at java.net.Socket.<init>(Socket.java:309)
at java.net.Socket.<init>(Socket.java:124)
at
sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:22)
at
sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:128)
at
sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:562)
... 5 more