[sctp-dev] Undefined symbol problems in libsctp.so running with java 1.6

[Jason Kania]

Hello,

For RHEL 5 linux with kernel 2.6.18-92.1.22.el5, I downloaded the latest JDK 7 source and libsctp.so library. I am attempting to use the code modified for java 1.6, but I am encountering the following problem:

> java -Xbootclasspath/a:sctp6.jar -classpath app.jar TestSCTP
Exception in thread "main" java.lang.UnsupportedOperationException: /usr/java/jre1.6.0_12/lib/i386/libsctp.so: undefined symbol: sctp_getladdrs
        at sun.nio.ch.SctpNet.socket0(Native Method)
        at sun.nio.ch.SctpNet.socket(SctpNet.java:82)
        at sun.nio.ch.SctpChannelImpl.<init>(SctpChannelImpl.java:131)
        at com.sun.nio.sctp.SctpChannel.open(SctpChannel.java:165)
        at TestSCTP.main(TestSCTP.java:4)

app.jar is simply a jar to hold the TestSCTP.class file.

The problem is the same when I use the libsctp.so file from the SCTP on 1.6 instruction page

http://openjdk.java.net/projects/sctp/html/sctp6.html

>From the error output, the library  is definitely being found.

When I use the nm command to list what symbols are in the library, I get the following name with "nio_" prefix instead:
> nm /usr/java/jre1.6.0_12/lib/i386/libsctp.so
...
nio_sctp_getladdrs
...

The ldd output looks as follows:

> ldd /usr/java/jre1.6.0_12/lib/i386/libsctp.so
        linux-gate.so.1 =>  (0xffffe000)
        libnio.so => /usr/java/jre1.6.0_12/lib/i386/libnio.so (0xf7f58000)
        libnet.so => /usr/java/jre1.6.0_12/lib/i386/libnet.so (0xf7f44000)
        libpthread.so.0 => /lib/libpthread.so.0 (0xf7f27000)
        libdl.so.2 => /lib/libdl.so.2 (0xf7f23000)
        libjava.so => /usr/java/jre1.6.0_12/lib/i386/libjava.so (0xf7efd000)
        libjvm.so => not found
        libc.so.6 => /lib/libc.so.6 (0xf7dba000)
        libnsl.so.1 => /lib/libnsl.so.1 (0xf7da3000)
        /lib/ld-linux.so.2 (0xf7f66000)
        libjvm.so => not found
        libjvm.so => not found
        libverify.so => /usr/java/jre1.6.0_12/lib/i386/libverify.so (0xf7d96000)
        libjvm.so => not found

Permissions on the file and directories are all 755

The libsctp.jar library is included on the JVM command line as follows:

Any suggestions on a direction for resolving this?

Thanks for any help,

Jason
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