The project contains another dependency with the same archive name - eclipse

Question

I'm seeing the following error (and a couple of others like it) in my markers:
Invalid classpath publish/export dependency C:/Users/LevineJ/.m2/repository/org/bouncycastle/bcmail-jdk14/1.38/bcmail-jdk14-1.38.jar.
The project contains another dependency with the same archive name.
When I do a quick search, I find bcmail-jdk14.1.jar in two locations:
C:\Users\LevineJ.m2\repository\bouncycastle\bcmail-jdk14\138
C:\Users\LevineJ.m2\repository\org\bouncycastle\bcmail-jdk14\1.38
From what I've read on the topic (various posts/articles), I'm thinking this has to do with the error I'm seeing. Can someone please provide some info regarding:
1. What does this error mean?
2. How would I go about solving it?
If it helps, I'm using:
Eclipse Java EE - Luna Service Release 1 (4.4.1)
m2e plugin
m2e-wtp plugin
Results of mvn dependency:tree
C:\Users\LevineJ\Development\default-workspace\adweb>mvn dependency:tree
Picked up _JAVA_OPTIONS: -Dcom.gxs.common.configuration.proxy.envid=totcpa -Dcom.gxs.common.logging.configfilepath=C:\Users\LevineJ\Development\config\adweb\LogCfg.xml -Dcom.gxs.common.configuration.localenvid=adweb -Dcom.gxs.common.logging.sdklogfile=C:\Users\LevineJ\Development\config\adweb\tgo.log -Dcom.gxs.common.configuration.path=C:\Users\LevineJ\Development\config\adweb\CRC
[INFO] Scanning for projects...
[WARNING]
[WARNING] Some problems were encountered while building the effective model for com.gxs:adweb:war:${build.number}
[WARNING] 'version' contains an expression but should be a constant. # line 9, column 11
[WARNING] 'build.plugins.plugin.version' for org.codehaus.mojo:tomcat-maven-plugin is missing. # line 325, column 12
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING]
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building adweb ${build.number}
[INFO] ------------------------------------------------------------------------
[WARNING] The POM for com.gxs:reportservice-client:jar:05.09.00.16 is missing, no dependency information available
[INFO]
[INFO] --- maven-dependency-plugin:2.3:tree (default-cli) # adweb ---
[WARNING] Missing POM for com.gxs:reportservice-client:jar:05.09.00.16
[INFO] com.gxs:adweb:war:${build.number}
[INFO] +- com.opentext.ix.ad:adcommon:jar:LATEST:compile
[INFO] | +- com.gxs.imclient:IMclient:jar:07.24.00.03:compile
[INFO] | +- com.gxs.e2eui:wscommon:jar:1.0:compile
[INFO] | | +- org.apache.woden:woden-impl-dom:jar:1.0M8:compile
[INFO] | | | +- org.apache.woden:woden-api:jar:1.0M8:compile
[INFO] | | | +- org.apache.ws.commons.schema:XmlSchema:jar:1.4.2:compile
[INFO] | | | +- org.apache.ant:ant:jar:1.7.0:compile
[INFO] | | | +- wsdl4j:wsdl4j:jar:1.6.2:compile
[INFO] | | | +- xerces:xercesImpl:jar:2.8.1:compile
[INFO] | | | +- xerces:xmlParserAPIs:jar:2.6.0:compile
[INFO] | | | \- org.apache.ws.commons.axiom:axiom-api:jar:1.2.7:compile
[INFO] | | | +- org.apache.geronimo.specs:geronimo-activation_1.1_spec:jar:1.0.1:compile
[INFO] | | | +- org.apache.geronimo.specs:geronimo-javamail_1.4_spec:jar:1.2:compile
[INFO] | | | \- jaxen:jaxen:jar:1.1.1:compile
[INFO] | | \- xml-apis:xml-apis:jar:1.3.04:compile
[INFO] | +- com.gxs.e2eui:imqsclient:jar:1.0:compile
[INFO] | | \- org.apache.axis2:axis2-jws-api:jar:1.4.1:compile
[INFO] | | +- org.apache.ant:ant-launcher:jar:1.7.0:compile
[INFO] | | +- org.apache.ws.commons.axiom:axiom-impl:jar:1.2.7:compile
[INFO] | | +- org.apache.ws.commons.axiom:axiom-dom:jar:1.2.7:compile
[INFO] | | +- javax.mail:mail:jar:1.4.2:compile
[INFO] | | | \- javax.activation:activation:jar:1.1:compile
[INFO] | | +- xalan:xalan:jar:2.7.0:compile
[INFO] | | +- org.codehaus.woodstox:wstx-asl:jar:3.2.4:compile
[INFO] | | \- org.apache.geronimo.specs:geronimo-stax-api_1.0_spec:jar:1.0.1:compile
[INFO] | +- com.gxs:reportservice-client:jar:05.09.00.16:compile
[INFO] | +- org.springframework.data:spring-data-commons-core:jar:1.4.1.RELEASE:compile
[INFO] | +- org.springframework.ws:spring-oxm:jar:1.5.10:compile
[INFO] | | +- org.springframework.ws:spring-xml:jar:1.5.10:compile
[INFO] | | \- commons-logging:commons-logging:jar:1.1.1:compile
[INFO] | +- org.springframework:spring-context:jar:3.1.2.RELEASE:compile
[INFO] | | +- org.springframework:spring-aop:jar:3.1.2.RELEASE:compile
[INFO] | | +- org.springframework:spring-expression:jar:3.1.2.RELEASE:compile
[INFO] | | \- org.springframework:spring-asm:jar:3.1.2.RELEASE:compile
[INFO] | +- com.fasterxml.jackson.core:jackson-annotations:jar:2.3.2:compile
[INFO] | +- com.fasterxml.jackson.module:jackson-module-jaxb-annotations:jar:2.3.2:compile
[INFO] | +- org.springframework:spring-core:jar:3.1.2.RELEASE:compile
[INFO] | +- org.apache.httpcomponents:httpclient:jar:4.3.3:compile
[INFO] | | +- org.apache.httpcomponents:httpcore:jar:4.3.2:compile
[INFO] | | \- commons-codec:commons-codec:jar:1.6:compile
[INFO] | +- org.apache.commons:commons-lang3:jar:3.3.2:compile
[INFO] | +- org.slf4j:slf4j-api:jar:1.7.5:compile
[INFO] | +- org.slf4j:jcl-over-slf4j:jar:1.7.5:runtime
[INFO] | +- org.slf4j:slf4j-log4j12:jar:1.7.5:runtime
[INFO] | \- com.thoughtworks.xstream:xstream:jar:1.2.2:compile
[INFO] | \- xpp3:xpp3_min:jar:1.1.3.4.O:compile
[INFO] +- org.jboss.spec:jboss-javaee-6.0:pom:1.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.annotation:jboss-annotations-api_1.1_spec:jar:1.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.resource:jboss-connector-api_1.5_spec:jar:1.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.ejb:jboss-ejb-api_3.1_spec:jar:1.0.0.Final:provided
[INFO] | | \- javax.xml:jaxrpc-api:jar:1.1:provided
[INFO] | | \- javax.xml.soap:saaj-api:jar:1.3:provided
[INFO] | +- org.jboss.spec.javax.el:jboss-el-api_2.2_spec:jar:1.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.interceptor:jboss-interceptors-api_1.1_spec:jar:1.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.security.jacc:jboss-jacc-api_1.4_spec:jar:1.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.enterprise.deploy:jboss-jad-api_1.2_spec:jar:1.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.security.auth.message:jboss-jaspi-api_1.0_spec:jar:1.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.xml.registry:jboss-jaxr-api_1.0_spec:jar:1.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.jms:jboss-jms-api_1.1_spec:jar:1.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.servlet.jsp:jboss-jsp-api_2.2_spec:jar:1.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.servlet:jboss-servlet-api_3.0_spec:jar:1.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.transaction:jboss-transaction-api_1.1_spec:jar:1.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.xml.bind:jboss-jaxb-api_2.2_spec:jar:1.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.xml.rpc:jboss-jaxrpc-api_1.1_spec:jar:1.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.xml.soap:jboss-saaj-api_1.3_spec:jar:1.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.xml.ws:jboss-jaxws-api_2.2_spec:jar:1.0.0.Final:provided
[INFO] | +- javax.enterprise:cdi-api:jar:1.0-SP4:provided
[INFO] | +- javax.jws:jsr181-api:jar:1.0-MR1:provided
[INFO] | +- org.hibernate.javax.persistence:hibernate-jpa-2.0-api:jar:1.0.0.Final:provided
[INFO] | +- org.jboss.resteasy:jaxrs-api:jar:2.1.0.GA:provided
[INFO] | +- stax:stax-api:jar:1.0.1:provided
[INFO] | \- javax.validation:validation-api:jar:1.0.0.GA:provided
[INFO] +- com.fasterxml.jackson.core:jackson-databind:jar:2.3.2:compile
[INFO] +- com.fasterxml.jackson.core:jackson-core:jar:2.3.2:compile
[INFO] +- com.sun.faces:jsf-api:jar:LATEST:compile
[INFO] +- com.sun.faces:jsf-impl:jar:LATEST:compile
[INFO] +- javax.servlet:jstl:jar:1.2:compile
[INFO] +- commons-fileupload:commons-fileupload:jar:1.3.1:compile
[INFO] +- commons-io:commons-io:jar:2.4:compile
[INFO] +- org.primefaces:primefaces:jar:4.0:compile
[INFO] +- org.primefaces.extensions:primefaces-extensions:jar:2.0.0:compile
[INFO] | \- com.google.code.gson:gson:jar:2.2.4:compile
[INFO] +- org.primefaces.themes:all-themes:jar:LATEST:compile
[INFO] +- javax.inject:javax.inject:jar:1.0-PFD-1:compile
[INFO] +- org.springframework:spring-web:jar:3.1.2.RELEASE:compile
[INFO] | +- aopalliance:aopalliance:jar:1.0:compile
[INFO] | \- org.springframework:spring-beans:jar:3.1.2.RELEASE:compile
[INFO] +- commons-lang:commons-lang:jar:2.6:compile
[INFO] +- log4j:log4j:jar:1.2.15:compile
[INFO] +- xstream:xstream:jar:1.1.2:compile
[INFO] +- junit:junit:jar:4.11:compile
[INFO] | \- org.hamcrest:hamcrest-core:jar:1.3:compile
[INFO] +- org.mockito:mockito-all:jar:1.8.5:test
[INFO] +- org.springframework:spring-test:jar:3.1.2.RELEASE:compile
[INFO] +- org.glassfish.web:el-impl:jar:2.2:compile
[INFO] | \- javax.el:el-api:jar:2.2:compile
[INFO] +- com.lowagie:itext:jar:2.1.7:compile
[INFO] | +- bouncycastle:bcmail-jdk14:jar:138:compile
[INFO] | +- bouncycastle:bcprov-jdk14:jar:138:compile
[INFO] | \- org.bouncycastle:bctsp-jdk14:jar:1.38:compile
[INFO] | +- org.bouncycastle:bcprov-jdk14:jar:1.38:compile
[INFO] | \- org.bouncycastle:bcmail-jdk14:jar:1.38:compile
[INFO] +- com.gxs:primefaces-theme-tgo:jar:01.00.00.01:compile
[INFO] +- com.gxs:crc-client:jar:2.0.11:compile
[INFO] +- com.gxs:crc-system:jar:2.0.11:compile
[INFO] +- com.gxs.tglogging:tglogging:jar:05.09.00.02:compile
[INFO] +- com.gxs.fms:FMSClient:jar:LATEST:compile
[INFO] \- com.opentext:metrics-service-dto:jar:LATEST:compile
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.374 s
[INFO] Finished at: 2014-11-14T11:26:44-05:00
[INFO] Final Memory: 12M/306M
[INFO] ------------------------------------------------------------------------
Screenshot of Maven Dependencies/Build Path
Screenshot of Deployment Assembly
Thanks.

Answer 1

The issue is that runtime *.jar dependencies are published into WEB-APP/lib folder. If two dependencies have the same name, they can not be published.
The strange thing with your issue is that itext (with its bouncycastle dependencies) are pretty common. Several projects in our company have it, but I have never seen a similar warning.
So this makes me wonder, where the issue comes from. The two duplicate dependencies (bcmail and bcprov) are actually not duplicate - they have different version (hence different JAR name). So the issue must be somewhere else.
Please check your Java Build Path (or check .classpath project file) settings and Deployment Assembly settings. You must have unintentionally included bcmail duplicate manually.
Also make sure you don't have bcmail-jdk14-1.38.jar in your src/main/webapp/WEB-INF/lib/.
And last possible suspect might be some unconventional JBoss deployment configuration combining two projects into one web application. But I am not that familiar with JBoss Tools (just guessing you are using it based on your dependencies).

Answer 2

I've checked all answers above but they don't work for me. I found that my Maven project has a different directory than regular Java Web project. I checked file .classpath in root directory and I changed
<attributes>
<attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
</attributes>
to
<attributes>
<attribute name="org.eclipse.jst.component.dependency" value="**WebRoot**/WEB-INF/lib"/>
</attributes>
which solved my problem

Answer 3

I was getting this issue because I was having following configuration
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.0.0</version>
<configuration>
<outputFileNameMapping>#{artifactId}#.#{extension}#</outputFileNameMapping>
</configuration>
</plugin>
When I added #version# to outputFileNameMapping, it resolved this error.
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.0.0</version>
<configuration>
<outputFileNameMapping>#{artifactId}#.#{extension}#.#{version}#</outputFileNameMapping>
</configuration>
</plugin>

Answer 4

This also happens if you load up another copy of the same project (the dependency project) in your workspace. Project A is dependent on Project B but if you add in Project B branchX then you'll have this problem.