I cannot create a Datagram Socket on Windows95 for JDK1.1.6J. This is
a REGRESSION from JDK1.1.5. I get the following exception:

% run_udp_server
VERBOSE: port number is = 26000
VERBOSE: loop count is = 0
DEBUG: creating datagram socket on port 26000
ERROR: udpServer.udpServer(): caught exception
java.lang.NullPointerException: null Address
java.lang.NullPointerException: null Address
at java.net.DatagramSocket.create(DatagramSocket.java:138)
at java.net.DatagramSocket.<init>(Compiled Code)
at udpServer.<init>(Compiled Code)
at udpServer.main(Compiled Code)
FINALSTATUS:udpServer:EXIT_ERROR:2:Number of ERRORS:1:TEST INCOMPLETE

I have a udpServer program and udpClient program that reproduces
the problem.

The programs are added as part of the attachment.

To run the programs type the following:

% uncompress udp.tar.Z
% tar xvf udp.tar
% cd udp
% javac *.java
% run_udp_server or run_udp_client


Hello,

I found the problem with BUGID: 4118392 on WINDOWS95 and WINDOWSNT.

4118392 P3/S3 JDK1.1.6J regression: Cannot create Datagram Socket
                      on Windows95. Get exception.

The problem is a JIT BUG. Static initialization is not getting done
in all cases.

Here is what happens:

I created and modified my own version of the JDK1.1.6J build and
added debugging statements in the files:

DatagramSocket.java
InetAddress.java

When I run my UDP application with this debugged build here is
what I found:

When I run with the JIT it does not get into the static initializer
code in the file: InetAddress.java

where it sets anyLocalAddress. Thus anyLocalAddress is null and that
is why the exception occurrs.

% java udpServer -d -v -l 0

VERBOSE: port number is = 26000
VERBOSE: loop count is = 0
DEBUG: creating datagram socket on port 26000
AEF: Here in DatagramSocket(int port, InetAddress laddr)
AEF: Here in create(int port, InetAddress laddr)
AEF: laddr = null
AEF: InetAddress.anyLocalAddress == null (BIG PROBLEM)
ERROR: udpServer.udpServer(): caught exception
java.lang.NullPointerException: null Address
java.lang.NullPointerException: null Address
at java.net.DatagramSocket.create(DatagramSocket.java:144)
at java.net.DatagramSocket.<init>(Compiled Code)
at udpServer.<init>(Compiled Code)
at udpServer.main(Compiled Code)
FINALSTATUS:udpServer:EXIT_ERROR:2:Number of ERRORS:1:TEST INCOMPLETE

When I run without the JIT it does get into the static initializer
code in the file: InetAddress.java

where it sets anyLocalAddress. Thus anyLocalAddress is not null
and the program works:

% java -nojit udpServer -d -v -l 0

VERBOSE: port number is = 26000
VERBOSE: loop count is = 0
DEBUG: creating datagram socket on port 26000
AEF: Here in DatagramSocket(int port, InetAddress laddr)
AEF: Here in create(int port, InetAddress laddr)
AEF: laddr = null
AEF: Here in static initializer in file: InetAddress.java
AEF: anyLocalAddress = AEFPC /0.0.0.0
DEBUG: DATAGRAM SOCKET INFO
DEBUG: --------------------
DEBUG: getLocalPort() = 26000
DEBUG: getSoTimeout() = 0
DEBUG: Dump getLocalAddress()
DEBUG: INET ADDRESS INFO
DEBUG: -----------------
DEBUG: getHostName() = AEFPC
DEBUG: getAllByName[0] = AEFPC /0.0.0.0
DEBUG: getByName() = AEFPC /0.0.0.0
DEBUG: getLocalHost() = aefpc.east.sun.com/129.148.27.249
DEBUG: getHostAddress() = 0.0.0.0
DEBUG: isMulticastAddress() = false


The UDP program is added as an attachment: