Where do I put db.jar when using in a servlet?

servlet container library level, or servlet library? I am guessing that because db.jar uses JNI code, reloading would be a problem, so it should reside at the servlet container library level, but it would be nice to know for sure.

Hi Garey,
Because using the Java API in Berkeley DB (BDB) implies making JNI calls, you should place the "db.jar" JAR file under your servlet container library directory (e.g. for Tomcat this should be "common/lib").
All servlet engines use separate classloaders for each web application. You need to ensure that the native BDB library is loaded by the servlet engine's common classloader.
If you place the "db.jar" file under your web app's WEB-INF/lib directory you will get errors like "UnsatisfiedLinkError: Native library <path_to_BDB_lib>\libdbNN.dll already loaded in another classloader" when reloading your servlet.
Of course, the directory where the native library resides, should be included the PATH or LD_LIBRARY_PATH (java.library.path) environment variables.
Regards,
Andrei

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I have successfully deploy the interest.jar on my linux box.But when deploying cd.jar it tells me that "Could not deploy file:/usr/local/JBoss-2.4.3_Tomcat-3.2.3/jboss/tmp/deploy/Default/cd.jar,
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src
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com/web_tomorrow/utils/*.class META-INF/
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[ejb-jar.xml]
<?xml version="1.0" encoding="Cp1252"?>
<ejb-jar>
<display-name>MusicCDs</display-name>
<enterprise-beans>
<entity>
<description>Models a music CD</description>
<ejb-name>CDBean</ejb-name>
<home>com.web_tomorrow.cd.CDHome</home>
<remote>com.web_tomorrow.cd.CD</remote>
<ejb-class>com.web_tomorrow.cd.CDBean</ejb-class>
<persistence-type>Container</persistence-type>
<prim-key-class>java.lang.String</prim-key-class>
<reentrant>False</reentrant>
<cmp-field><field-name>id</field-name></cmp-field>
<cmp-field><field-name>title</field-name></cmp-field>
<cmp-field><field-name>artist</field-name></cmp-field>
<cmp-field><field-name>type</field-name></cmp-field>
<cmp-field><field-name>notes</field-name></cmp-field>
<primkey-field>id</primkey-field>
</entity>
<session>
<description>Models a music CD collection</description>
<ejb-name>CDCollectionBean</ejb-name>
<home>com.web_tomorrow.cd.CDCollectionHome</home>
<remote>com.web_tomorrow.cd.CDCollection</remote>
<ejb-class>com.web_tomorrow.cd.CDCollectionBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Bean</transaction-type>
<ejb-ref>
<ejb-ref-name>ejb/CD</ejb-ref-name>
<ejb-ref-type>Entity</ejb-ref-type>
<home>com.web_tomorrow.cd.CDHome</home>
<remote>com.web_tomorrow.cd.CD</remote>
<ejb-link>com.web_tomorrow.cd.CDBean</ejb-link>
</ejb-ref>
</session>
</enterprise-beans>
<assembly-descriptor>
<container-transaction>
<method>
<ejb-name>CDBean</ejb-name>
<method-name>*</method-name>
</method>
<trans-attribute>Required</trans-attribute>
</container-transaction>
</assembly-descriptor>
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[jboss.xml]
<?xml version="1.0" encoding="Cp1252"?>
<jboss>
<secure>false</secure>
<container-configurations />
<resource-managers />
<enterprise-beans>
<session>
<ejb-name>CDCollectionBean</ejb-name>
<jndi-name>cd/CDCollection</jndi-name>
<configuration-name></configuration-name>
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<entity>
<ejb-name>CDBean</ejb-name>
<jndi-name>cd/CD</jndi-name>
<configuration-name></configuration-name>
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Best Regards!

$(jboss_home)/log/server.log told me that i should have a look at Container.java first.So i openned it and found the following code snippet:
Logger.debug("Binding an EJBReference "+ref.getName());
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open the ejb-jar.xml,i found link is defined as below:
<ejb-ref>
<ejb-ref-name>ejb/CD</ejb-ref-name>
<ejb-ref-type>Entity</ejb-ref-type>
<home>com.web_tomorrow.cd.CDHome</home>
<remote>com.web_tomorrow.cd.CD</remote>
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</ejb-ref>
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The problem itself isnot complicate but it demonstrated that the open source is good for you to fix the bug up!
BTW,in order to making it easy to fix the bug, the jboss binay version is built with debug infomation.So you can rebuid it without any debug infomation.
<target name="compile" depends="prepare">
<mkdir dir="${build.classes.dir}"/>
<javac srcdir="${src.dir}"
destdir="${build.classes.dir}"
debug="on" <- change it to "off"
deprecation="off"
optimize="on"
includes="org/**"
excludes="**/activation/**, **/*BeanInfo.java"
>
<classpath refid="classpath"/>
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</target>
Thanks for all your help!

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> I am considering upgrading my LabView software from 6i to 6.1 for the
> new "two click" remote front panel feature. I have already seen a demo
> of this feature but have just a few questions before I get the
> upgrade:
>
> My setup consists of several pieces of equipment connected to Labview
> via GPIB, to aid in the evaluation of a new microchip.
>
> 1. I wish to grant control of the setup to anyone with a web browser,
> Is the remote monitoring feature compatible with both Netscape and IE?
>
Yes. Provided they are resonably modern versions.
> 2. The VI which controls the setup is currently located on the PC
> beside my setup. When I embed a VI in a remote front panel, where does
> the processing take place, is the local VI still controlling the
>
setup? and the remote panel just sending and receiving data from the
> local VI.
>
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