Deploying Spring webapp on Apache Karaf 4.0.0.M2 - spring

Question

Please help me to resolve the following error while deploying the war in Apache Karaf. I use maven to build the war file. Below is the pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.test</groupId>
<artifactId>MyApp</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>MyApp Maven Webapp</name>
<url>http://maven.apache.org</url>
<properties>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.source>1.8</maven.compiler.source>
<springframework.version>4.0.6.RELEASE</springframework.version>
<servlet.version>3.1.0</servlet.version>
<hibernate.version>4.3.8.Final</hibernate.version>
<commons.version>1.4.1</commons.version>
<mysql.version>5.1.34</mysql.version>
<c3p0.version>0.9.1.2</c3p0.version>
</properties>
<dependencies>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.5</version>
</dependency>
<dependency>
<groupId>commons-validator</groupId>
<artifactId>commons-validator</artifactId>
<version>${commons.version}</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>${servlet.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${springframework.version}</version>
</dependency>
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>${c3p0.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
<dependency>
<groupId>org.apache.activemq</groupId>
<artifactId>activemq-core</artifactId>
<version>5.7.0</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.3.2</version>
</dependency>
<dependency>
<groupId>fop</groupId>
<artifactId>fop</artifactId>
<version>0.20.5</version>
</dependency>
<dependency>
<groupId>net.sf.jtidy</groupId>
<artifactId>jtidy</artifactId>
<version>r938</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.4</version>
</dependency>
</dependencies>
<build>
<finalName>MyApp</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>${maven.compiler.source}</source>
<target>${maven.compiler.target}</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
I'm able to build the war can successfully deploy it in tomcat. But it fails in Karaf. Please see the karaf console below. Please help to resolve this problem.
karaf#root()> bundle:install -s "webbundle:file:///D:/MyApp.war?Web-ContextPath=/MyApp"
Bundle IDs:
Error executing command: Error installing bundles:
Unable to install bundle webbundle:file:///D:/MyApp.war?Web-ContextPath=/MyApp
karaf#root()> log:display
2015-03-25 16:48:33,439 | ERROR | nsole user karaf | ShellUtil | 41 - org.apache.karaf.shell.core - 4.
0.0.M2 | Exception caught while executing command
org.apache.karaf.shell.support.MultiException: Error installing bundles:
Unable to install bundle webbundle:file:///D:/MyApp.war?Web-ContextPath=/MyApp
at org.apache.karaf.shell.support.MultiException.throwIf(MultiException.java:61)
at org.apache.karaf.bundle.command.Install.execute(Install.java:116)[21:org.apache.karaf.bundle.core:4.0.0.M2]
at org.apache.karaf.shell.impl.action.command.ActionCommand.execute(ActionCommand.java:83)[41:org.apache.karaf.shell.
core:4.0.0.M2]
at org.apache.karaf.shell.impl.console.osgi.secured.SecuredCommand.execute(SecuredCommand.java:67)[41:org.apache.kara
f.shell.core:4.0.0.M2]
at org.apache.karaf.shell.impl.console.osgi.secured.SecuredCommand.execute(SecuredCommand.java:87)[41:org.apache.kara
f.shell.core:4.0.0.M2]
at org.apache.felix.gogo.runtime.Closure.executeCmd(Closure.java:480)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.felix.gogo.runtime.Closure.executeStatement(Closure.java:406)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.felix.gogo.runtime.Pipe.run(Pipe.java:108)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:182)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:119)[41:org.apache.karaf.shell.core:4.0.0.M2]
at org.apache.felix.gogo.runtime.CommandSessionImpl.execute(CommandSessionImpl.java:94)[41:org.apache.karaf.shell.cor
e:4.0.0.M2]
at org.apache.karaf.shell.impl.console.ConsoleSessionImpl.run(ConsoleSessionImpl.java:267)[41:org.apache.karaf.shell.
core:4.0.0.M2]
at java.lang.Thread.run(Thread.java:744)[:1.8.0]
Caused by: java.lang.Exception: Unable to install bundle webbundle:file:///D:/MyApp.war?Web-ContextPath=/MyApp
at org.apache.karaf.bundle.command.Install.execute(Install.java:79)[21:org.apache.karaf.bundle.core:4.0.0.M2]
... 11 more
Caused by: org.osgi.framework.BundleException: Duplicate import: javax.servlet.jsp
at org.apache.felix.framework.util.manifestparser.ManifestParser.normalizeImportClauses(ManifestParser.java:366)[org.
apache.felix.framework-4.4.1.jar:]
at org.apache.felix.framework.util.manifestparser.ManifestParser.<init>(ManifestParser.java:180)[org.apache.felix.fra
mework-4.4.1.jar:]
at org.apache.felix.framework.BundleRevisionImpl.<init>(BundleRevisionImpl.java:121)[org.apache.felix.framework-4.4.1
.jar:]
at org.apache.felix.framework.BundleImpl.createRevision(BundleImpl.java:1243)[org.apache.felix.framework-4.4.1.jar:]
at org.apache.felix.framework.BundleImpl.<init>(BundleImpl.java:112)[org.apache.felix.framework-4.4.1.jar:]
at org.apache.felix.framework.Felix.installBundle(Felix.java:2907)[org.apache.felix.framework-4.4.1.jar:]
at org.apache.felix.framework.BundleContextImpl.installBundle(BundleContextImpl.java:165)[org.apache.felix.framework-
4.4.1.jar:]
at org.apache.karaf.bundle.command.Install.execute(Install.java:77)[21:org.apache.karaf.bundle.core:4.0.0.M2]
... 11 more
karaf#root()>

Answer 1

It's right in the log:
Caused by: org.osgi.framework.BundleException: Duplicate import: javax.servlet.jsp
might hit a bug in Karaf/Pax URL WAR there.
In your case it might be better to create a WAB, it will still be deployable to a tomcat server.
EDIT:
as answer to the extra question, also take a look at the Pax Web provided samples, and especially this one
an excerpt from the POM:
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<extensions>true</extensions>
<configuration>
<supportedProjectTypes>
<supportedProjectType>jar</supportedProjectType>
<supportedProjectType>bundle</supportedProjectType>
<supportedProjectType>war</supportedProjectType>
</supportedProjectTypes>
<instructions>
<Bundle-SymbolicName>${bundle.symbolicName}</Bundle-SymbolicName>
<Bundle-Version>${project.version}</Bundle-Version>
<Import-Package>
org.springframework.osgi.web.context.support,
org.springframework.web.servlet.view,
org.springframework.web.servlet,
*; resolution:=optional
</Import-Package>
<Export-Package>org.ops4j.pax.web.samples.spring.*,!*</Export-Package>
<Bundle-Classpath>
WEB-INF/classes
</Bundle-Classpath>
<Web-ContextPath>war-spring</Web-ContextPath>
<Embed-Dependency>*; artifactId=!org.osgi.compendium; scope=compile; type=!pom; inline=true</Embed-Dependency>
<Embed-Transitive>true</Embed-Transitive>
<_removeheaders>
Include-Resource,
Private-Package,
Embed-Dependency,
Embed-Transitive,
Ignore-Package
</_removeheaders>
</instructions>
</configuration>
<executions>
<execution>
<id>generate-manifest</id>
<phase>process-classes</phase>
<goals>
<goal>manifest</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<configuration>
<archive>
<manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>
</archive>
</configuration>
</plugin>