JOSHUA-264 System.exit() calls are replaced by throw new RuntimeException()

[thammegowda]

This PR replaces system exit calls with runtime exception

• The error messages are preserved by passing them as message argument
• the redundant catch blocks are replaced with compact catch blocks
• The cause for exceptions are propagated to RuntimeException's cause where applicable

Note :

• Some exit calls from main function are left untouched since they are most likely be invoked from CLI

[mjpost]

I can't compile this — Are you using Ivy here?

[mjpost]

Oh, I see, you are building off JOSHUA-252. We will need to merge that in with master first.

[thammegowda]

This is based on Maven build.
Since the files are moved to new location in maven build, I branched off from JOSHUA-252 to avoid merge conflicts later time.

[mjpost]

Can you describe the maven build process? What version do you use, and what command do you type?

[thammegowda]

My maven version

$ mvn --version
Apache Maven 3.0.5
Maven home: /usr/share/maven
Java version: 1.8.0_91, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-8-oracle/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.19.0-32-generic", arch: "amd64", family: "unix"

To compile :

mvn clean compile

To package

mvn clean package # this fails if there are test failures
mvn clean package -DskipTests # to skip tests

To run main method in a class:

mvn compile exec:java -Dexec.mainClass=org.apache.joshua.decoder.JoshuaDecoder

[thammegowda]

@mjpost Added maven-assembly-plugin to make the build cycle easy: #14

[lewismc]

Nice, I've been working on the eats for the last hour or so, so I'll update feature branch once this is done.
@matt did you merge this PR into feature branch? If so then thanks very much.

[KellenSunderland]

Hey Thamme, thanks for the great PR. Haven't checked the build yet myself but the commit looks good to me.