Unable to 'Maven Build' my Java Project in Eclipse IDE

Question

I have a working Java Project (literally just 2 JAVA files) that need to be built in either Maven or Gradle. Since I wrote my Java Project in Eclipse IDE for Java Delopers (Kepler Service Release 2, 20140224-0627), I found this article to add Maven to my Java Project.

After adding Maven to my project, I had to follow this SO answer to allow myself to Right Click the Project -> Maven -> Update Project... properly. If I Right Click the Project -> Run As -> Maven Clean, I get a BUILD SUCCESS (thanks to this SO answer). But now when I Right Click the Project -> Run As -> Maven Install, I get the following:

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building AMC 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-resources-plugin:2.5:resources (default-resources) @ RobTillmanProject ---
[debug] execute contextualize
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory D:\Users\names\workspace\paging-mission-control\AMC\src\main\resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ RobTillmanProject ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding Cp1252, i.e. build is platform dependent!
[INFO] Compiling 2 source files to D:\Users\names\workspace\paging-mission-control\AMC\target\classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.050s
[INFO] Finished at: Tue Feb 07 16:35:15 EST 2023
[INFO] Final Memory: 8M/245M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project RobTillmanProject: Compilation failure
[ERROR] No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

As per the error, it looks like I need to add a JDK to the Installed JREs list (just as this SO answer suggests).

In Eclipse IDE, Windows -> Preferences -> Java -> Installed JREs, I have jre1.8.0_333 (default) installed. On my PC, in my C:\Program Files\Java folder, I've installed jdk-17, jdk-17.0.6 and jdk-19.0.2. However, when I go to add any one of the JDKs (I've tried JRE Type Standard 1.1x VM and Standard VM), I get the error message Target is not a JDK root. System library was not found.

I'm running Eclipse IDE on Windows 10.

Any suggestions?

Answer 1

Make sure you are adding the correct location for the JDK home in the "Installed JREs" section.

For instance, I am using JDK 8 and selecting the JDK as the default as below:

Make sure you are also changing the compiler version to use the one matching your JDK. Other side, like your are using maven clean install to build your project, then make sure the maven distribution is using the correct JAVA_HOME.

In Eclipse, go to again Window / Preferences / Maven / Installations

Select your local maven distribution instead of using the embed version with Eclipse, for instance:

You can check if your maven distribution is using the correct JDK by typing in a cmd : mvn -version, for example in my Windows I am using JDK 11 like you can see in the below output:

Hope this can help. Please let me know.