I have been looking for a while for practical examples to understand Maven relative paths best practices to get Resources, however I got confused, hoping you could please support me to understand what are best practices to get Resources and how to apply to a concrete example:
Concrete Example:
Structure Say I have the following structure and trying to get a resource(located in resources) from a class in the folder planning, so basically I am trying to create a String of a relative path that is consistent with maven execution:
├───.settings ├───images ├───src │ ├───main │ │ ├───java │ │ │ └───com │ │ │ └───moga │ │ │ ├───planning --->Trying to get a resource from here │ │ │ ├───population │ │ │ │ ├───chromossome │ │ │ │ ├───gene │ │ │ │ └───initialpopulation │ │ │ └───utils │ │ └───resources │ │ └───com │ │ └───moga │ │ └───planning │ │ └───sample │ └───test │ ├───java │ │ └───com │ │ └───moga │ │ ├───planning │ │ └───population │ │ ├───chromossome │ │ └───gene │ └───resources │ └───com │ └───moga │ └───planning <-- Resource that I want to get is here │ └───sample └───target ├───classes │ └───com │ └───moga │ ├───planning │ │ └───sample │ ├───population │ │ ├───chromossome │ │ ├───gene │ │ └───initialpopulation │ └───utils ├───generated-sources │ └───annotations ├───generated-test-sources │ └───test-annotations ├───maven-archiver ├───maven-status │ └───maven-compiler-plugin │ ├───compile │ │ └───default-compile │ └───testCompile │ └───default-testCompile ├───surefire-reports └───test-classes └───com └───moga ├───planning │ └───sample └───population ├───chromossome └───gene Class RunCapacityPlanning that gets the resource I am currently using the following quick fix
Path pathCapacityPlanningGeneral = Paths.get(System.getProperty("user.dir"), "src","test","resources","com","moga","planning","paramsGeneral.txt"); File file = new File(pathCapacityPlanningGeneral.toString()); if (!file.exists()) { System.out.println("File Do not exist"); System.out.println(pathCapacityPlanningGeneral.toString()); } The above code is builded with mvn package and the file exists(Do not print the message).
POM
... <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <maven.compiler.source>1.7</maven.compiler.source> <maven.compiler.target>1.7</maven.compiler.target> </properties> ... Approaches Here are some potential approaches I have found:
- Maven Official
File file = new File( path ); if ( !file.isAbsolute() ) { file = new File( project.getBasedir(), file ); }
To test this approach, here is what I tried:
From this I understand that I should add this to my POM
<properties> <project.basedir>somepath</project.basedir> ... </properties> - What should I add in this somepath? I have tested leaving somepath blank and trying to print in my class to understand, however it shows cannot be resolved.
public static void main(String[] args) throws IOException { // 1) Approach 1 // $ cannot be resolved to a variable, // project cannot be resolved System.out.println(${project.baseDir}); - Use getResource Basically I tested modify the main file:
URL pathCapacityPlanningGeneral = RunCapacityPlanning.class.getResource("paramsGeneral.txt"); File file = new File(pathCapacityPlanningGeneral.toString()); if (!file.exists()) { System.out.println("File Do not exist"); System.out.println(pathCapacityPlanningGeneral.toString()); } The above after mvn package java -cp target/CapacityPlan-1.0-SNAPSHOT.jar com.moga.planning.RunCapacityPlanning throws:
File Do not exist jar:file:/C:/Users/.../capacityplan/target/capacityplan-1.0-SNAPSHOT.jar!/com/moga/planning/paramsGeneral.txt Do anybody knows what I am doing wrong in this approach?
Thanks so much in advance
