Resource from src main resources not found after building with maven

Question

Hello I m using a configuration file from src main resources in my java application  I m reading it in my Class like this    new BufferedReader new FileReader new File  src main resources config txt        So now I m building this with maven using mvn assembly assembly  Here is the bit for that in my pom xml     lt plugin gt                   lt artifactId gt maven-assembly-plugin lt  artifactId gt                   lt version gt 2 3 lt  version gt                   lt configuration gt                       lt finalName gt TestSuite lt  finalName gt                       lt descriptorRefs gt                           lt descriptorRef gt jar-with-dependencies lt  descriptorRef gt                       lt  descriptorRefs gt                       lt archive gt                           lt manifest gt                               lt addClasspath gt true lt  addClasspath gt                               lt mainClass gt com some package Test lt  mainClass gt                           lt  manifest gt                       lt  archive gt                   lt  configuration gt               lt  plugin gt    So when I run my app I get this error    src main resources config txt  The system cannot find the path specified    But when I right click on my assembled jar I can see it inside  anyone knows what I m doing wrong

User · Answer

Once after we build the jar will have the resource files under BOOT-INF/classes or target/classes folder, which is in classpath, use the below method and pass the file under the src/main/resources as method call getAbsolutePath("certs/uat_staging_private.ppk"), even we can place this method in Utility class and the calling Thread instance will be taken to load the ClassLoader to get the resource from class path.

 public String getAbsolutePath(String fileName) throws IOException {
      return Thread.currentThread().getContextClassLoader().getResource(fileName).getFile();
  }

we can add the below tag to tag in pom.xml to include these resource files to build target/classes folder

<resources>
        <resource>
            <directory>src/main/resources</directory>
            <includes>
                <include>**/*.properties</include>
                <include>**/*.ppk</include>
            </includes>
        </resource>
</resources>

User · Answer

You can replace the src main resources  directly by classpath   So for your example you will replace this line   new BufferedReader new FileReader new File  src main resources config txt        By this line   new BufferedReader new FileReader new File  classpath config txt

User · Answer

The resources you put in src main resources will be copied during the build process to target classes which can be accessed using      this getClass   getResourceAsStream   config txt

User · Answer

FileReader reads from files on the file system   Perhaps you intended to use something like this to load a file from the class path     this will look in src main resources before building and myjar jar  after building  InputStream is   MyClass class getClassloader                         getResourceAsStream  config txt      Or you could extract the file from the jar before reading it

User · Answer

I think assembly plugin puts the file on class path  The location will be different in in the JAR than you see on disk  Unpack the resulting JAR and look where the file is located there

User · Answer

Resources from src main resources will be put onto the root of the classpath  so you ll need to get the resource as   new BufferedReader new InputStreamReader getClass   getResourceAsStream   config txt        You can verify by looking at the JAR WAR file produced by maven as you ll find config txt in the root of your archive

[java] Resource from src/main/resources not found after building with maven

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