Improve MAVEN build Performance

[ChenZhangg]

Parallel builds in Maven 3 Maven 3.x has the capability to perform parallel builds.

Apache Maven Dependency Plugin can be used to find unused dependencies. And I found following list. Maybe we can remove them. as2-lib-parent-pom as2-lib {groupId='org.slf4j', artifactId='slf4j-simple', version='1.7.30', scope='test'} as2-partnership-mongodb {groupId='org.slf4j', artifactId='slf4j-simple', version='1.7.30', scope='test'} as2-servlet {groupId='org.slf4j', artifactId='slf4j-simple', version='1.7.30', scope='test'} as2-demo-webapp {groupId='org.slf4j', artifactId='slf4j-simple', version='1.7.30', scope='compile'} {groupId='com.sun.xml.bind', artifactId='jaxb-impl', version='2.3.3', scope='compile'} {groupId='javax.servlet', artifactId='javax.servlet-api', version='3.1.0', scope='provided'} as2-server {groupId='org.slf4j', artifactId='jul-to-slf4j', version='1.7.30', scope='compile'} {groupId='org.apache.logging.log4j', artifactId='log4j-core', version='2.14.1', scope='compile'} {groupId='org.apache.logging.log4j', artifactId='log4j-slf4j-impl', version='2.14.1', scope='compile'} {groupId='com.sun.xml.bind', artifactId='jaxb-impl', version='2.3.3', scope='compile'} as2-demo-spring-boot {groupId='org.springframework.boot', artifactId='spring-boot-starter-web', version='2.5.3', scope='compile'} {groupId='com.sun.xml.bind', artifactId='jaxb-impl', version='2.3.3', scope='compile'} {groupId='org.springframework.boot', artifactId='spring-boot-starter-test', version='2.5.3', scope='test'} {groupId='org.slf4j', artifactId='slf4j-api', version='1.7.30', scope='compile'}

===================== If there are any inappropriate modifications in this PR, please give me a reply and I will change them.

[phax]

Hi @ChenZhangg thanks for your PR, but I will not merge it:

• Travis stopped playing nice with OSS projects and they don't give away continuous "credits" - so this is no longer used.
• For the other artefacts: all of them are included via SPI or Reflection, so there is no hard coded dependency. All of them are indeed needed. Have you removed them and run the web application e.g.?

[ChenZhangg]

I just run dependency:analyze command and thought some dependencies are forgotten to be removed. The Apache Maven Dependency Plugin still need to be improved.......

[phax]

Well, I guess this is something the Maven Dependency plugin can never solve, because the dependencies via Reflection are more or less impossible to find, except you execute the code....