CODEWITHSUNDEEP
javamavenconfigurationinputjar
Chris Watts
Chris Watts

Reputation: 2344

Read config file outside jar

I am trying to create jar where I can read a config file outside the jar file. Preferably from the directory where the jar file is located. My directory structure is as follows:

/src/main/resources/config

I have a maven project that I run mvn install on to create a jar file.

<plugin>
            <!-- Build an executable JAR -->
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <version>2.4</version>
            <configuration>
                <archive>
                    <manifest>
                        <addClasspath>true</addClasspath>
                        <classpathPrefix>lib/</classpathPrefix>
                        <mainClass>com.expedia.e3.qm.perforce.audit.Main</mainClass>
                    </manifest>
                    <manifestEntries>
                        <Class-Path>config/config.xml</Class-Path>
                    </manifestEntries>
                </archive>
                <excludes>
                    <exclude>**/config/</exclude>
                </excludes>
            </configuration>
        </plugin>

Right now I am manually moving my config folder from /target/classes/config to /target/config I have researched the maven assembly plugin however I have tried all the different configurations of it and I was unable to get it to output only to /target/config it would always output /target/audit-1.0/config where audit-1.0 is my maven project name.

I am using Intellij IDEA to debug my program and to build/install the maven project.

In code I am trying to access the file via 

InputStream stream = Class.class.getResourceAsStream("/config/config.xml");

Which works when I run it in the IDE however when I run it from the command line:

java -jar ./audit-1.0.jar

It throws an error after trying to access "inputStream":

Exception in thread "main" java.lang.NullPointerException

I understand that "/config/config.xml" should point to "/target/audit-1.0.jar!/config/config.xml". However, I would like it to point to "/target/config/config.xml"

Any ideas? Is this even possible?

Upvotes: 3

Views: 7057

Answers (1)

John Stadt
John Stadt

Reputation: 510

File base = new File(<Current class name here>.class.getProtectionDomain().getCodeSource().getLocation().toURI()).getParentFile();
File configFile= new File(base,"config.xml");

Upvotes: 3

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