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Maven copy only specific dependencies

I'm developping an OSGI email client with Maven following component-based software engineering. I must make sure that the dependencies between all my components are resolved inside of the OSGI container, so I cannot copy the dependencies inside the generated JARs, otherwise there would be no point using OSGI. But there is one dependency I really have to copy inside of the JAR, it's javax.mail, because I cannot find any OSGI-compatible bundle that does emailing.
To do that, I have seen this page: https://maven.apache.org/plugins/maven-dependency-plugin/examples/copying-artifacts.html
So I edited my pom.xml:
<project>
...
<build>
<plugins>
<plugin> <!-- to edit the MANIFEST.MF, required for OSGI -->
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<version>4.2.1</version>
<extensions>true</extensions>
<configuration>
<instructions>
<Class-Path>lib/</Class-Path>
... OSGI instructions ...
</instructions>
</configuration>
</plugin>
<plugin> <!-- to copy the dependencies -->
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>3.1.1</version>
<executions>
<execution>
<phase>install</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<artifactItems>
<artifactItem>
<groupId>com.sun.mail</groupId>
<artifactId>javax.mail</artifactId>
<version>1.6.2</version>
<outputDirectory>${project.build.directory}/lib</outputDirectory>
</artifactItem>
</artifactItems>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
...
</project>
But the <artifactItems> tag doesn't seem to work. When I mvn install, it copies ALL the dependencies into a dependency/ folder and not a lib/ folder. How can I do to copy only the javax.mail JAR into a folder named lib/?
Thank you for your help.

The maven-bundle-plugin allows to embed dependencies:
https://felix.apache.org/documentation/subprojects/apache-felix-maven-bundle-plugin-bnd.html
<Embed-Dependency>javax.mail|javax.mail-api</Embed-Dependency>

You mixed up the goals copy-dependencies and copy. Replace copy-dependencies by copy.
http://maven.apache.org/plugins/maven-dependency-plugin/copy-mojo.html

AspectJ not working in maven project in IntelliJ

I have maven project that use aspectJ for auditing. I'm use Intellij idea. Here is my plugin config in pom file:
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>aspectj-maven-plugin</artifactId>
<version>1.7</version>
<configuration>
<showWeaveInfo>true</showWeaveInfo>
<source>${java.version}</source>
<target>${java.version}</target>
<Xlint>ignore</Xlint>
<complianceLevel>${java.version}</complianceLevel>
<encoding>UTF-8</encoding>
<verbose>true</verbose>
</configuration>
<executions>
<execution>
<!-- IMPORTANT -->
<phase>process-sources</phase>
<goals>
<goal>compile</goal>
<goal>test-compile</goal>
</goals>
</execution>
</executions>
<dependencies>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjtools</artifactId>
<version>1.8.10</version>
</dependency>
</dependencies>
</plugin>
When I clean package the aspectJ plugin says:
Join point 'method-execution(java.util.List com.test.getHistories(java.lang.String, java.lang.String))' in Type 'com.test.HistoryService' (HistoryService.java:18) advised by around advice from 'com.test.aspects.AuditLoggerAspect' (AuditLoggerAspect.java:88)
Join point 'method-execution(java.lang.String com.test.getString(int, java.lang.Object))' in Type 'com.test' (AspectTest.java:14) advised by around advice from 'com.test.AuditLoggerAspect' (AuditLoggerAspect.class(from AuditLoggerAspect.java))
This app packaging is WAR and i want to deploy it on Weblogic.
When I deploy it or run test the aspect not work. Why?
I test this aspect and maven plugin config in Java App and it's work good.

When I clean and package the project, the maven-compiler-plugin recompiles the projects after aspectj-compiler-plugin compiled it. So the compiled aspects are removed.
I added the below config to maven-compiler-plugin to solve it:
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
<!-- IMPORTANT -->
<useIncrementalCompilation>false</useIncrementalCompilation>
</configuration>
</plugin>

Maven wsdl import. How to use the generated files?

i have a problem and I'm not able to solve or understand the hole workflow behind this process.
I use eclipse with maven.
This is my simple test pom.xml
...
<dependencies>
<dependency>
<groupId>com.sun.xml.ws</groupId>
<artifactId>jaxws-rt</artifactId>
<version>2.2.8</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.jvnet.jax-ws-commons</groupId>
<artifactId>jaxws-maven-plugin</artifactId>
<version>2.2</version>
<executions>
<execution>
<phase>generate-sources</phase>
<goals>
<goal>wsimport</goal>
</goals>
<configuration>
<xdebug>true</xdebug>
<verbose>true</verbose>
<keep>true</keep>
<packageName>abc.model</packageName>
<sourceDestDir>${project.build.directory}/generated-sources/wsimport/</sourceDestDir>
</configuration>
</execution>
</executions>
</plugin>
<plugin> <groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>1.9.1</version>
<executions>
<execution>
<id>add-source</id>
<phase>generate-sources</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>${project.build.directory}/generated-sources/wsimport/</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
...
The jaxws-maven-plugin generate the files in the sourceDestDir. The build-helper-maven-plugin add the files during the maven install process the to the correct folder and also into the resulting jar file. So far so good.
But I'm not able to use the generated files/classes in eclipse. So in eclipse maven does not recognize the files as source or does not but this in the source path. Did I make an mistake or did I miss something?
Thanks for your help.
Update:
I observer a strange behavior. Same test project same pom file. If I import this existing Maven Project in eclipse it works like expected. I can directly use the generated files as source.
But if I delete this source folder, I'm still not able to restore this with maven.

Unpack Maven dependency into classes, keeping transitive dependencies

I am trying to unpack a maven dependency jar's contents into my classes folder, and at the same time include the transitive dependencies. I also don't want to unpack all of my project's dependencies. Only one would be good, even better if I could do this to a list of them. Found similar solutions but nothing addressing my exact issue.
Example Main Project Pom:
.
.
.
<dependencies>
<dependency>
<groupId>com.test.dep</groupId>
<artifact>first-dependency</artifact>
</dependency>
<dependency>
<groupId>com.test.dep</groupId>
<artifact>second-dependency</artifact>
</dependency>
</dependencies>
.
.
.
Example second-dependency Pom:
.
.
.
<dependencies>
<dependency>
<groupId>com.test.dep</groupId>
<artifact>third-dependency</artifact>
</dependency>
<dependency>
<groupId>com.test.dep</groupId>
<artifact>fourth-dependency</artifact>
</dependency>
</dependencies>
.
.
.
I want second-dependency to be unpacked into my classes folder nested under target and also want any of the artifacts (third-dependency, fourth-dependency) it depends on to still be included in my lib folder (not unpacked).
I tried the following (without including the the artifact in my dependencies):
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<id>unpack</id>
<phase>generate-resources</phase>
<goals>
<goal>unpack</goal>
</goals>
<configuration>
<artifactItems>
<artifactItem>
<groupId>com.test.dep</groupId>
<artifactId>second-dependency</artifactId>
<type>jar</type>
<overWrite>true</overWrite>
<outputDirectory>${project.build.directory}/classes</outputDirectory>
<includes>**/*</includes>
</artifactItem>
</artifactItems>
</configuration>
</execution>
</executions>
</plugin>
And this did include the contents of second-dependency in my classes folder, but did not include third-dependency or fourth-dependency in my main projects lib directory.
Any ideas?

Try to use following plugin configuration, based on the described parameters of dependency:unpack-dependencies, instead:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<id>unpack</id>
<phase>generate-resources</phase>
<goals>
<goal>unpack</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/classes</outputDirectory>
<includeArtifactIds>second-dependency</includeArtifactIds>
</configuration>
</execution>
</executions>
</plugin>
Im not sure about your use case.
But if you want to build jar, that sounds like a use case for the maven-shade-plugin. This plugin is able to package the classes and resources of the project itself as well as of a specified set of artifacts (dependencies) into one jar.
Just define the artifact itself ("${project.groupId}:${project.artifactId}") and the "second dependency" to be included.
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.1</version>
<configuration>
<artifactSet>
<includes>
<include>${project.groupId}:${project.artifactId}</include>
<include>com.test.dep:second-dependency</include>
</includes>
</artifactSet>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
</execution>
</executions>
</plugin>

How to convert file separator in maven

I have a property defined like this:
<properties>
<main.basedir>${project.parent.basedir}</main.basedir>
</properties>
Since I use Windows as OS, it contains backslashes. I want to add this path to a glassfish domain as JVM option (using glassfish maven plugin). The problem is, that asadmin can consume only slash as separator, and all my backslashes keep on disappearing. How can I define a property with exactly the same content with slashes?

I don't think there is a non-programmatical way to do that. So I suggest a groovy one-liner with the Maven GMaven plugin (GMaven is usually the simplest way to embed programmatic code into a pom):
<plugin>
<groupId>org.codehaus.gmaven</groupId>
<artifactId>gmaven-plugin</artifactId>
<executions>
<execution>
<id>setproperty</id>
<phase>validate</phase>
<goals>
<goal>execute</goal>
</goals>
<configuration>
<source>
pom.properties['main.basedir']=project.parent.basedir.absolutePath.replace('\\','/');
</source>
</configuration>
</execution>
</executions>
</plugin>

Just an update to Sean's answer, I have had to make some minor adjustments in order to adapt it to the latest groovy maven plugin version:
<plugin>
<groupId>org.codehaus.gmaven</groupId>
<artifactId>groovy-maven-plugin</artifactId>
<dependencies>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-all</artifactId>
<version>2.0.1</version>
</dependency>
</dependencies>
<executions>
<execution>
<id>setproperty</id>
<phase>validate</phase>
<goals>
<goal>execute</goal>
</goals>
<configuration>
<source>
project.properties['basedir']=project.parent.basedir.absolutePath.replace('\\','/');
</source>
</configuration>
</execution>
</executions>
</plugin>