14 Replies Latest reply on Jan 9, 2015 5:20 AM by Perry Rhodan

    Linkage error wile using custom Oracle Driver(xa-datasource-class) in standalone.xml

    Jitendra Tiwari Newbie

      Hi All,

          I am trying to configure datasource in wildfly and for that I am using custom drive xa-datasource-class in standalone.xml. My custom class is using  XAResource/XACopnnection and other Javax classes.

        To configure the custom driver, I created a module for example com.oracle.jdbc and created a module.xml as below

      <module xmlns="urn:jboss:module:1.3" name="com.oracle.jdbc">

          <resources> 

             <resource-root path="ojdbc6-11.jar"/>

             <resource-root path="xmz.jar"/> //custom driver jar

          </resources>

          <dependencies>

              <module name="javax.api"/>

              <module name="javax.transaction.api"/>

          <module name="org.jboss.ironjacamar.jdbcadapters"/>

          </dependencies>

      </module>

       

          While starting server  I am facing the linkage error while doing so.

      Caused by: java.lang.LinkageError: loader constraint violation: loader (instance of <bootloader>) previously initiated loading for a different type with name "javax/transaction/xa/XAResource".

       

      Can somebody help me regarding the above issue. It would be a great help.

      Thanks

      Jtiwari

        • 1. Re: Linkage error wile using custom Oracle Driver(xa-datasource-class) in standalone.xml
          Philippe Marschall Expert

          What are the contents of xmz.jar? You you have a javax.transaction.xa.XAResource class in there?

          • 2. Re: Linkage error wile using custom Oracle Driver(xa-datasource-class) in standalone.xml
            Jitendra Tiwari Newbie

            Thank you Philippe for the quick reply,

            Yes,  xmz.jar is using javax.transaction.xa.XAResource . Actually, I have written a wrapper which is internally using  avax.transaction.xa.XAResource .

            I tried to debug it bit more detail level using  -verbose:class  and I  found that javax.transaction.xa.XAResource is being loaded from jdk\rt.jar. Since, Wildfly also loads javax module(javax.transaction.api), so, I believe  this may be the primary reason for the  Linkage Error.

             

            [Loaded javax.transaction.xa.XAResource from D:\Java\jdk\jre\lib\rt.jar]

             

            Any help will be highly appreciated.

            Thank you

            Jitendra Tiwari

            • 3. Re: Linkage error wile using custom Oracle Driver(xa-datasource-class) in standalone.xml
              Philippe Marschall Expert

              Is it just using javax.transaction.xa.XAResource or do you package it into the JAR?

              • 4. Re: Linkage error wile using custom Oracle Driver(xa-datasource-class) in standalone.xml
                Jitendra Tiwari Newbie

                yes , I packaged it as a jar, let me explain by the example

                 

                import javax.transaction.xa.XAResource

                class xyz(){

                   // using XAResource/XAConnection

                }

                packaged it into a jar called xmz.jar

                 

                Thanks

                Jitendra Tiwari

                • 5. Re: Linkage error wile using custom Oracle Driver(xa-datasource-class) in standalone.xml
                  Philippe Marschall Expert

                  You must not have any javax.transaction.* classes in the xmz.jar. It is ok to have classes there that use javax.transaction.* classes.

                          <module name="javax.api"/>

                          <module name="javax.transaction.api"/>

                  Will provide the javax.transaction.* classes to you at runtime.

                  • 6. Re: Linkage error wile using custom Oracle Driver(xa-datasource-class) in standalone.xml
                    Jitendra Tiwari Newbie

                    Hello Philippe,

                        I am using many custom wrapper classes inside xmz.jar,

                    MYConnection.java uses javax.transaction..xa.XAConnection.

                    Mydatasource.java uses javax.transaction..xa.XADatasource

                     

                    Please suggest, how can I get rid of this issue.

                     

                    Thanks.

                    Jitendra Tiwari

                    • 7. Re: Linkage error wile using custom Oracle Driver(xa-datasource-class) in standalone.xml
                      Philippe Marschall Expert

                      Having custom classes that use javax.transaction.* classes in xmz.jar is totatlly fine. Packing javax.transaction.* into xmz.jar is an issue. Just build xmz.jar containing your custom wrapper classes but do not include javax.transaction.* classes in the JAR.

                      • 8. Re: Linkage error wile using custom Oracle Driver(xa-datasource-class) in standalone.xml
                        Jitendra Tiwari Newbie

                        Hello Philippe,

                        Thanks a lot for your suggestions.

                              I verified the xmz.jar,  This jar does not contain any  javax.transaction.*  classes, only internally my custom classes are using those classes .  But yes, since my code is depend on ironjacamar-jdbc-1.1.5.Final.jar and ojdbc6.jar. I used these two jar just to compile my code.


                        Apart from that, I tried to remove all the jar from my application having javax package.

                        One more thing I observed that XAResource is getting loaded by the JDK rt.jar

                        [Loaded javax.transaction.xa.XAResource from <JAVA_HOME>\jre\lib\rt.jar].

                        That I believe may be the root cause.

                        I am not sure how to avoid class loading from rt.jar.

                        I tried almost every possible options. Any help on this issue would really be appreciated .


                        Thank You.

                        Jitendra Tiwari

                         

                        • 9. Re: Linkage error wile using custom Oracle Driver(xa-datasource-class) in standalone.xml
                          Perry Rhodan Newbie
                          [Loaded javax.transaction.xa.XAResource from <JAVA_HOME>\jre\lib\rt.jar].

                           

                          Can someone explain why javax.transaction.xa.XAResource is also loaded from JDK? As far as i understand the javax.transaction package is NOT getting exported from jboss "sun.jdk" module (and also nowhere else) and thus should not be accessible by any classloader in Jboss/Wildfly?

                          <?xml version="1.0" encoding="UTF-8"?>

                           

                          <!--

                            ~ JBoss, Home of Professional Open Source.

                            ~ Copyright 2010, Red Hat, Inc., and individual contributors

                            ~ as indicated by the @author tags. See the copyright.txt file in the

                            ~ distribution for a full listing of individual contributors.

                            ~

                            ~ This is free software; you can redistribute it and/or modify it

                            ~ under the terms of the GNU Lesser General Public License as

                            ~ published by the Free Software Foundation; either version 2.1 of

                            ~ the License, or (at your option) any later version.

                            ~

                            ~ This software is distributed in the hope that it will be useful,

                            ~ but WITHOUT ANY WARRANTY; without even the implied warranty of

                            ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

                            ~ Lesser General Public License for more details.

                            ~

                            ~ You should have received a copy of the GNU Lesser General Public

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                            ~ Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA

                            ~ 02110-1301 USA, or see the FSF site: http://www.fsf.org.

                            -->

                          <module xmlns="urn:jboss:module:1.3" name="sun.jdk">

                              <resources>

                                  <!-- currently jboss modules has not way of importing services from

                                  classes.jar so we duplicate them here -->

                                  <resource-root path="service-loader-resources"/>

                              </resources>

                              <dependencies>

                                  <system export="true">

                                      <paths>

                                          <path name="com/sun/script/javascript"/>

                                          <path name="jdk/nashorn/api/scripting"/>

                                          <path name="com/sun/image/codec/jpeg"/>

                                          <path name="com/sun/imageio/plugins/bmp"/>

                                          <path name="com/sun/imageio/plugins/common"/>

                                          <path name="com/sun/imageio/plugins/gif"/>

                                          <path name="com/sun/imageio/plugins/jpeg"/>

                                          <path name="com/sun/imageio/plugins/png"/>

                                          <path name="com/sun/imageio/plugins/wbmp"/>

                                          <path name="com/sun/imageio/spi"/>

                                          <path name="com/sun/imageio/stream"/>

                                          <path name="com/sun/jndi/dns"/>

                                          <path name="com/sun/jndi/ldap"/>

                                          <path name="com/sun/jndi/url"/>

                                          <path name="com/sun/jndi/url/corbaname"/>

                                          <path name="com/sun/jndi/url/dns"/>

                                          <path name="com/sun/jndi/url/iiop"/>

                                          <path name="com/sun/jndi/url/iiopname"/>

                                          <path name="com/sun/jndi/url/ldap"/>

                                          <path name="com/sun/jndi/url/ldaps"/>

                                          <path name="com/sun/media/sound"/>

                                          <path name="com/sun/crypto/provider"/>

                                          <path name="com/sun/org/apache/xml/internal/security/transforms/implementations"/>

                                          <path name="com/sun/security/auth"/>

                                          <path name="com/sun/security/auth/login"/>

                                          <path name="com/sun/security/auth/module"/>

                                          <path name="com/sun/tools/internal/xjc"/>               

                                          <path name="sun/awt"/>

                                          <path name="sun/awt/color"/>

                                          <path name="sun/awt/datatransfer"/>

                                          <path name="sun/awt/dnd"/>

                                          <path name="sun/awt/event"/>

                                          <path name="sun/awt/geom"/>

                                          <path name="sun/awt/im"/>

                                          <path name="sun/awt/image"/>

                                          <path name="sun/awt/image/codec"/>

                                          <path name="sun/awt/motif"/>

                                          <path name="sun/awt/resources"/>

                                          <path name="sun/awt/shell"/>

                                          <path name="sun/awt/util"/>

                                          <path name="sun/awt/windows"/>

                                          <path name="sun/awt/X11"/>

                                          <path name="sun/dc"/>

                                          <path name="sun/print"/>

                                          <path name="sun/print/resources"/>

                                          <path name="sun/security/action"/>

                                          <path name="sun/security/pkcs"/>

                                          <path name="sun/security/x509"/>

                                          <path name="sun/jdbc/odbc"/>

                                          <path name="sun/jdbc/odbc/ee"/>

                                          <path name="sun/font"/>

                                          <path name="sun/misc"/>

                                          <path name="sun/io"/>

                                          <path name="sun/nio"/>

                                          <path name="sun/nio/ch"/>

                                          <path name="sun/nio/cs"/>

                                          <path name="sun/nio/cs/ext"/>

                                          <path name="sun/security"/>

                                          <path name="sun/security/util"/>

                                          <path name="sun/security/krb5"/>

                                          <path name="sun/util"/>

                                          <path name="sun/util/calendar"/>

                                          <path name="sun/util/locale"/>

                                          <path name="sun/util/resources"/>

                                          <path name="sun/security/pkcs11"/>

                                          <path name="sun/security/provider"/>

                                          <path name="sun/text"/>

                                          <path name="META-INF/services"/>

                                      </paths>

                                      <exports>

                                          <include-set>

                                              <path name="META-INF/services"/>

                                          </include-set>

                                      </exports>

                                  </system>

                              </dependencies>

                          </module>

                          • 10. Re: Linkage error wile using custom Oracle Driver(xa-datasource-class) in standalone.xml
                            Philippe Marschall Expert

                            Is it really loaded from the JDK and not from the javax.transaction.api module?

                            • 11. Re: Linkage error wile using custom Oracle Driver(xa-datasource-class) in standalone.xml
                              Perry Rhodan Newbie

                              To be correct, the XAResource class is loaded from javax.transaction.api module

                              [Loaded javax.transaction.xa.XAResource from jar:file:/C://wildfly-8.1.0.Final/modules/system/layers/base/javax/transaction/api/main/jboss-transaction-api_1.2_spec-1.0.0.Final.jar!/]

                               

                              but later in deployment there is an attempt to load XAResource class also from JDK (i think because we defined a datasource in standalone.xml using jdbcdslog) but the loader rejects this:

                              [Loaded javax.transaction.xa.XAResource from C:\Program Files\Java\jdk1.7.0_60\jre\lib\rt.jar]

                              [Constraint check failed for name javax/transaction/xa/XAResource, loader <bootloader>: the presented class object differs from that stored ]

                              We have jdbcdslog included as a module,

                              <module xmlns="urn:jboss:module:1.1" name="org.jdbcdslog">

                                  <resources>

                                      <resource-root path="jdbcdslog-1.0.5.jar"/>

                                  </resources>

                                  <dependencies>

                                      <module name="org.slf4j"/>     

                                      <module name="javax.api"/>

                                      <module name="javax.transaction.api"/>     

                                      <!-- TODO: add other database modules as other optional dependencies like h2 -->

                                      <module name="com.oracle.ojdbc6" optional="true" />     

                                  </dependencies>

                              </module>

                               

                              which runs into loader constraint violation trouble with XAResource class:

                               

                              Caused by: java.lang.LinkageError: loader constraint violation: loader (instance of <bootloader>) previously initiated loading for a different type with name "javax/transaction/xa/XAResource"

                                  at java.lang.Class.getDeclaredMethods0(Native Method) [rt.jar:1.7.0_60]

                                  at java.lang.Class.privateGetDeclaredMethods(Class.java:2570) [rt.jar:1.7.0_60]

                                  at java.lang.Class.privateGetPublicMethods(Class.java:2690) [rt.jar:1.7.0_60]

                                  at java.lang.Class.getMethods(Class.java:1467) [rt.jar:1.7.0_60]

                                  at sun.misc.ProxyGenerator.generateClassFile(ProxyGenerator.java:426) [rt.jar:1.7.0_60]

                                  at sun.misc.ProxyGenerator.generateProxyClass(ProxyGenerator.java:323) [rt.jar:1.7.0_60]

                                  at java.lang.reflect.Proxy$ProxyClassFactory.apply(Proxy.java:671) [rt.jar:1.7.0_60]

                                  at java.lang.reflect.Proxy$ProxyClassFactory.apply(Proxy.java:591) [rt.jar:1.7.0_60]

                                  at java.lang.reflect.WeakCache$Factory.get(WeakCache.java:244) [rt.jar:1.7.0_60]

                                  at java.lang.reflect.WeakCache.get(WeakCache.java:141) [rt.jar:1.7.0_60]

                                  at java.lang.reflect.Proxy.getProxyClass0(Proxy.java:454) [rt.jar:1.7.0_60]

                                  at java.lang.reflect.Proxy.newProxyInstance(Proxy.java:736) [rt.jar:1.7.0_60]

                                  at org.jdbcdslog.XAConnectionLoggingProxy.wrap(XAConnectionLoggingProxy.java:10)

                                  at org.jdbcdslog.DataSourceProxyBase.getXAConnection(DataSourceProxyBase.java:126)

                                  at org.jboss.jca.adapters.jdbc.xa.XAManagedConnectionFactory.getXAManagedConnection(XAManagedConnectionFactory.java:497)

                                  ... 12 more

                               

                              jdbcdslog problematic source seems to be:

                              package org.jdbcdslog;

                              import java.lang.reflect.Proxy;

                              import javax.sql.XAConnection;

                               

                              public class XAConnectionLoggingProxy {

                               

                                  public static XAConnection wrap(XAConnection con) {

                                     return (XAConnection)Proxy.newProxyInstance(con.getClass().getClassLoader() , new Class[]{XAConnection.class}, new GenericLoggingProxy(con));

                                 }

                               

                              }

                               

                              XAConnection.getClass().getClassLoader seems to reference a classloader which tries to load another version of javax.transaction.xa.XAResource than provided by javax.transaction.api module =  java.lang.LinkageError: loader constraint violation?

                               

                              Am i correct?

                              • 12. Re: Linkage error wile using custom Oracle Driver(xa-datasource-class) in standalone.xml
                                Perry Rhodan Newbie

                                Philipe Marschall schrieb:

                                 

                                Is it really loaded from the JDK and not from the javax.transaction.api module?

                                Rhodan76 schrieb:

                                 

                                To be correct, the XAResource class is loaded from javax.transaction.api module

                                [Loaded javax.transaction.xa.XAResource from jar:file:/C://wildfly-8.1.0.Final/modules/system/layers/base/javax/transaction/api/main/jboss-transaction-api_1.2_spec-1.0.0.Final.jar!/]

                                 

                                but later in deployment there is an attempt to load XAResource class also from JDK (i think because we defined a datasource in standalone.xml using jdbcdslog) but the loader rejects this:

                                [Loaded javax.transaction.xa.XAResource from C:\Program Files\Java\jdk1.7.0_60\jre\lib\rt.jar]

                                [Constraint check failed for name javax/transaction/xa/XAResource, loader <bootloader>: the presented class object differs from that stored ]

                                 

                                The question is, why is there a second attempt to load javax/transaction/xa/XAResource but from a different library (rt.jar of JDK) insteadof "javax.transaction.api" module. All modules only have declared dependencies to "javax.transaction.api" module.

                                • 13. Re: Linkage error wile using custom Oracle Driver(xa-datasource-class) in standalone.xml
                                  Philippe Marschall Expert

                                  Which classloader does

                                  org.jdbcdslog.XAConnectionLoggingProxy.wrap(XAConnectionLoggingProxy.java:10)

                                  pass to Proxy.newProxyInstance?

                                  • 14. Re: Linkage error wile using custom Oracle Driver(xa-datasource-class) in standalone.xml
                                    Perry Rhodan Newbie

                                    Philippe Marschall schrieb:

                                     

                                    Which classloader does

                                    org.jdbcdslog.XAConnectionLoggingProxy.wrap(XAConnectionLoggingProxy.java:10)

                                    pass to Proxy.newProxyInstance?

                                    The classloader of another module ("com.oracle.ojdbc6"):

                                     

                                    ModuleClassLoader for Module "com.oracle.ojdbc6:main" from local module loader @38f4f222 (finder: local module finder @5944b364 (roots: C:\wildfly-8.1.0.Final\modules,C:\wildfly-8.1.0.Final\modules\system\layers\base))

                                     

                                    module definition:

                                     

                                    <?xml version="1.0" encoding="UTF-8"?>
                                    <module xmlns="urn:jboss:module:1.0" name="com.oracle.ojdbc6">
                                        <resources>
                                            <resource-root path="com.oracle.ojdbc6-11.2.0.jar"/>
                                        </resources>
                                        <dependencies>
                                            <module name="javax.api"/>
                                            <module name="javax.transaction.api"/>
                                        </dependencies>
                                    </module>