5 Replies Latest reply on Jan 12, 2011 3:23 AM by izgur

Native library already loaded in another classloader ?! (Axis2)

izgur Dec 21, 2010 5:21 AM

Hello!

I'm doing a web service which sends a file over SFTP.

I downloaded the chilkat jar files and send the file over FTP with no problem (as an application).

All scenarious when deploying with Axis2, but I think, only the 1. could be made to work:

My app.java includes system.loadLibrary(chilkat) and when making the axis archiver .aar file, I add the chilkat.jar

Native Library D:\KKISSWORK\jboss-5.1.0.GA-jdk6\bin\chilkat.dll already loaded in another classloader

2. My app.java doesn't include system.loadLibraty

If I include the jar when making .aar file: ERROR: com.chilkatsoft.chilkatJNI.new_CkSFtp()J

If i don't include the jar when making .aar file: ERROR: new_CksFtp

Any idea how to solve that?

I know that the problem is that the classloader can't load a library twice, but how to solve that.

Somewhere i read that I should load the library (in my app) from the classloader....

Thanks in advance!

BR. Igor!

1. Native library already loaded in another classloader ?! (Axis2)

izgur Jan 11, 2011 5:15 AM (in response to izgur)

Anybody?:)

I heard there are 2 possibilities.

1st: try other version of the library (i'll test now)
2nd: write your own classloader

I believe the 1st possibility isn't going to work, but I'll try. So, my question:

??? HOW TO WRITE YOUR OWN CLASSLOADER FOR JBOSS ???

or If anybody knows how to send a file over SFTP in BPEL

Anybody tried ?
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2. Native library already loaded in another classloader ?! (Axis2)

izgur Jan 11, 2011 10:49 AM (in response to izgur)

http://wiki.apache.org/tomcat/HowTo#I.27m_encountering_classloader_problems_when_using_JNI_under_Tomcat

Make a shared lib ? How ?
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3. Native library already loaded in another classloader ?! (Axis2)

jaikiran Jan 11, 2011 11:28 AM (in response to izgur)

Igor JStarter wrote:

Make a shared lib ? How ?
Try placing it in JBOSS_HOME/server/<servername>/lib folder.
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4. Native library already loaded in another classloader ?! (Axis2)

izgur Jan 12, 2011 3:16 AM (in response to jaikiran)

No change if I copy the jar to /server/default/lib/.

If I don't have the jar in the jboss/bin, i always get:
com.chilkatsoft.chilkatJNI.new_CkSFtp()J

If I have the jar in the jboss/bin and don't load the jar into the axis2 archive when making it:
com.chilkatsoft.chilkatJNI.new_CkSFtp()J

If I have the jar in the jboss/bin and load it when making axis2 archive:
native library already loaded...

And there are no changes... no matter where I copy the library
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5. Native library already loaded in another classloader ?! (Axis2)

izgur Jan 12, 2011 3:23 AM (in response to izgur)

If I understand this right...

Because I have chilkat in jboss/bin, it probably loaded by the classloader...

And because I loaded chilkat into the axis2 archive, it will load this library too -> error: already loaded...

I have to tell axis2 that he should use the SHARE lib, which is /server/default/lib ?? And not take his attached library ...

Is this right ?

What is more... I read about changing <attribute name="UseJBossWebLoader"> to TRUE could force JBoss to load every library just once.
Anybody did that ?
I don't even find that .... shuold be in jbossweb-tomcat55.sar/META-INF/jboss-service.xml, but I don't find that in JBoss5.1 in the jbossweb.sar
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