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From "Alexey Varlamov" <alexey.v.varla...@gmail.com>
Subject Re: [general][qa] Tried to use harmony on a small in-house project; issues follow
Date Mon, 21 May 2007 14:54:42 GMT
Hi Alex,

2007/5/21, Alex Grigorovich <alex.grigorovich@gmail.com>:
> Hi!
> I thought you may be interested: here's a recollection of problems I
> have encountered while trying to use Harmony for a small project at
> work.

Thanks for the feedback, we're quite interested indeed.

> First, jmock-based unit tests fail when run under Harmony's JVM.
> Compiler doesn't seem to matter: both sun's and harmony's work. I have
> attached a sample program which reproduces the following error:
This uncovers a bug in JMock2, matching reflection method instances
via identity operator ('==' vs equals()), see
I will report this issue to JMock developers until you beat me to it ;)

> Second, our java.nio-based network code which works on Sun's JVM
> throws a SockectExcepion on innocent-looking code:
> java.net.SocketException
>        at org.apache.harmony.luni.platform.OSNetworkSystem.select(OSNetworkSystem.java:312)
>        at org.apache.harmony.nio.internal.SelectorImpl.selectInternal(SelectorImpl.java)
>        at org.apache.harmony.nio.internal.SelectorImpl.select(SelectorImpl.java:167)
>        at com.shamrock.smf.niosmpp.net.SelectorHandler.run(SelectorHandler.java:156)
> These exceptions don't seem to affect the application though. They
> seem to happen after setting OP_WRITE on each interesting selection
> key. Relevant portion of source code looks like this (unfortunately I
> cannot provide a short runnable example):
>       while (true) {
>            try {
>                /* register new channels etc. */
>                synchronized(this.writableKeys) {
>                    /* for each key in writableKeys */
>                    if (key.isValid()) {
>                        key.interestOps(key.interestOps() |
> SelectionKey.OP_WRITE);
>                    }
>                }
>                selector.select(selectTimeout);
>                Set set = selector.selectedKeys();
>                /* process selected keys */
>                set.clear();
>            }
>        }
> However, the problem might as well be in buggy application code. Any
> ideas on how to debug this?
I did not look closer here, we have a few decent networking experts on
the list, just wait them to speak up. BTW, do you mind to file a bug
report to JIRA for this issue?

> Third, VM hard-codes default character set to iso-8859-1 instead of
> using process' locale settings. Every UTF-8 user then has to manually
> set file.encoding system property, or otherwise get garbage on console
> when output does not fit in ASCII.
Yep, there is already a bunch of entries in our bug tracker depending
on this same issue, it must be fixed soon.

> Lastly, is there a native javac adapter for ant? One can use
> build.compiler=extJavac or write a custom CompilerAdapter, but a
> drop-in replacement for Sun's javac would be nice. Google even finds
> an implementation of com.sun.tools.javac.Main in harmony's subversion
> repo, but it seems to have been removed later (for trademark
> reasons?).
Sure, there is jdktools subproject which currently provides javac,
javah, keytool & jarsigner, and there is universal native starter for
all of them. The removed sources were mere duplicates between
"classlib" and "jdktools" subprojects.
Seems you've tried M1 binary snapshot, you've probably chosen a JRE
download? I believe JDK snapshots includes javac executable among
other tools...

> Harmony & OS details:
> $ java -version
> Apache Harmony Launcher : (c) Copyright 1991, 2006 The Apache Software
> Foundation or its licensors, as applicable.
> java version "1.5.0"
> pre-alpha : not complete or compatible
> svn = r533500, (Apr 30 2007), Linux/ia32/gcc 4.1.0, release build
> http://incubator.apache.org/harmony
> OS: Debian linux 4.0, kernel: 2.6.18-4-686 #1 SMP, libc-2.3.6
> Thank you.
> --
> Alexey Grigorovich

Stay tuned, Harmony advances in a good pace. So hope to hear from you
again once in a while ;)

Alexey Varlamov

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