81
votes

I have a maven project forked and cloned from a git repo onto my eclipse. It is build on Java 8. The first thing i do is perform a

mvn clean install

But I get following failure message:

[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building Maven 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ Maven ---
[INFO] Deleting /Users/vshukla/git/Prism/target
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ Maven ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory /Users/vshukla/git/Prism/src/main/resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ Maven ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!
[INFO] Compiling 66 source files to /Users/vshukla/git/Prism/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /Users/vshukla/git/Prism/src/main/java/PrenPost/scanUtility.java:[54,52] diamond operator is not supported in -source 1.5
  (use -source 7 or higher to enable diamond operator)
[ERROR] /Users/vshukla/git/Prism/src/main/java/main/AppUtility.java:[87,86] diamond operator is not supported in -source 1.5
  (use -source 7 or higher to enable diamond operator)
[ERROR] /Users/vshukla/git/Prism/src/main/java/PrenPost/ComparisionUtility.java:[58,52] diamond operator is not supported in -source 1.5
  (use -source 7 or higher to enable diamond operator)
[INFO] 3 errors 
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.266 s
[INFO] Finished at: 2017-03-01T12:11:27+05:30
[INFO] Final Memory: 13M/309M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project Maven: Compilation failure: Compilation failure:
[ERROR] /Users/vshukla/git/Prism/src/main/java/PrenPost/scanUtility.java:[54,52] diamond operator is not supported in -source 1.5
[ERROR] (use -source 7 or higher to enable diamond operator)
[ERROR] /Users/vshukla/git/Prism/src/main/java/main/AppUtility.java:[87,86] diamond operator is not supported in -source 1.5
[ERROR] (use -source 7 or higher to enable diamond operator)
[ERROR] /Users/vshukla/git/Prism/src/main/java/PrenPost/ComparisionUtility.java:[58,52] diamond operator is not supported in -source 1.5
[ERROR] (use -source 7 or higher to enable diamond operator)
[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

However, below is the build path details of the project which clearly has JRE - 8 set up: build path

and the compilation set up:

Compliance level

No matter how many times I build the project, i get the same error. Even after cleaning the project and refreshing it from eclipse doesn't help. Please guide.

UPDATE:

After adding the properties to set maven compiler plugin

<properties>
 <maven.compiler.source>1.8</maven.compiler.source>
 <maven.compiler.target>1.8</maven.compiler.target>
</properties>

,

am getting the below error:

[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building Maven 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ Maven ---
[INFO] Deleting /Users/vshukla/git/Prism/target
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ Maven ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory /Users/vshukla/git/Prism/src/main/resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ Maven ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!
[INFO] Compiling 66 source files to /Users/vshukla/git/Prism/target/classes
[INFO] -------------------------------------------------------------
[WARNING] COMPILATION WARNING : 
[INFO] -------------------------------------------------------------
[WARNING] /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java: /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java uses or overrides a deprecated API.
[WARNING] /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java: Recompile with -Xlint:deprecation for details.
[WARNING] /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java: Some input files use unchecked or unsafe operations.
[WARNING] /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java: Recompile with -Xlint:unchecked for details.
[INFO] 4 warnings 
[INFO] -------------------------------------------------------------
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java:[26,22] package com.apple.eawt does not exist
[ERROR] /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java:[93,41] cannot find symbol
  symbol: class Application
[ERROR] /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java:[93,67] cannot find symbol
  symbol: variable Application
[INFO] 3 errors 
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.591 s
[INFO] Finished at: 2017-03-01T13:09:47+05:30
[INFO] Final Memory: 21M/347M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project Maven: Compilation failure: Compilation failure:
[ERROR] /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java:[26,22] package com.apple.eawt does not exist
[ERROR] /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java:[93,41] cannot find symbol
[ERROR] symbol: class Application
[ERROR] /Users/vshukla/git/Prism/src/main/java/main/MainUITabbed.java:[93,67] cannot find symbol
[ERROR] symbol: variable Application
[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

And here is the code snippet giving the compilation error from MainUITabbed class:

import com.apple.eawt.Application;
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {


                Application application = Application.getApplication(); // line 93

                ImageIcon imgicon = new ImageIcon(getClass().getResource(
                        "ICON.jpg"));
                Image img = imgicon.getImage();


                application.setDockIconImage(img);

                MainUITabbed frame = new MainUITabbed();
                frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();

            }
        }
    });
}
24
Do you have the dependency: <dependency> <groupId>com.apple</groupId> <artifactId>AppleJavaExtensions</artifactId> <version>1.4</version> </dependency> in your pom.xml?DrHopfen
No. Let me try.roger_that
Brilliant. It worked. But how? Why was that error?roger_that
Because you were obviously using that library. For maven to know to add the classes in there to the classpath you have to define the dependencies accordingly.DrHopfen
What is AppleJavaExtensions here?Is that your java class namechamzz.dot

24 Answers

136
votes

The error occurred because the code is not for the default compiler used there. Paste this code in effective POM before the root element ends, after declaring dependencies, to change the compiler used. Adjust version as you need.

<dependencies>
...
</dependencies>
<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
    </plugins>
</build>
36
votes

I don't think that IDE is relevant here. After all you're running a Maven and Maven doesn't have a source that will allow to compile the diamond operators. So, I think you should configure maven-compiler-plugin itself.

You can read about this here. But in general try to add the following properties:

<properties>
 <maven.compiler.source>1.8</maven.compiler.source>
 <maven.compiler.target>1.8</maven.compiler.target>
</properties>

and see whether it compiles now in Maven only.

5
votes

In my case, it was caused from an incompatibility with OpenJDK 9 (which I haven't investigated).

If you don't need JDK 9, a temporary work-around would be to purge it from your machine:

sudo apt-get remove --purge openjdk-9-jdk openjdk-9-jre 
sudo apt-get remove --purge openjdk-9-jdk-headless openjdk-9-jre-headless
5
votes

You should add the code into pom.xml like:

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
</properties>
5
votes

make sure java home path is correct. for my case, java home path is wrong in pom file.

  <properties>
        <java.home>/usr/java/jdk1.8.0_45/bin/javac</java.home>
  </properties>




              <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                        <artifactId>maven-compiler-plugin</artifactId>
                        <version>3.5.1</version>
                <configuration>
                      <verbose>true</verbose>
                      <fork>true</fork>
                      <executable>${java.home}</executable>
                   <compilerVersion>1.8</compilerVersion>
                   <source>1.8</source>
                   <target>1.8</target>
                 </configuration>
             </plugin>
5
votes

This is an irritating error that pops up once in a while , jotting down some steps which help:

Writing answer from eclipse perspective as base logic will remain the same whether done by Intellij or command line

  1. Rt click your project -> Maven -> Update project -> Select Force update -> Click OK
  2. Under properties tag , add :
<maven.compiler.source>1.8</maven.compiler.source> 
<maven.compiler.target>1.8</maven.compiler.target>
  1. In some instances, you will start seeing error as we tried force update saying , failure to transfer X dependency from Y path , resolutions will not be reattempted , bla bla bla

    In such case quickly fix it by cd to .m2/repository folder and run following command :

for /r %i in (*.lastUpdated) do del %i
5
votes

If your local jdk version is 11 or 9, 10, and your project's java source/target version is 1.8, and you are using org.projectlombok:lombok package, then you can try to update its version to 1.16.22 or 1.18.12, like this:

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.22</version>
        </dependency>

It just solved my issue.

4
votes

In case if you are able to compile mvn compile the project successful from terminal but not from Eclipse check out Window > Preferences >Installed JREs, make sure you have selected JRE that is under JDK (check out the paths of 2 different JRE's in pic), as Maven needs JDK to compile you need to add it.

Installed JREs

3
votes

I had the same problem and I Changed this

<configuration>
    <source>1.7</source>
    <target>1.7</target>
 </configuration>

here 1.7 is my JDK version.it was solved.

3
votes

Buddy,
If every this is up-to-date, even then you are having this problem, then
try running this command from the terminal directly instead of running from eclipse.
$ mvn clean install

and make sure these things:

  • maven is in system path
  • all maven dependencies are avaialble at `.m2/repository`
  • java is in system path


2
votes

for it was comming because of java version mismatch ,so I have corrected it and i am able to build the war file.hope it will help someone

    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
2
votes

Doing this in pom.xml file and after updating the project, the problem is gone.

<plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.4</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
</configuration>
</plugin>
  1. Update the pom.xml under <plugin></plugin>.

  2. Update your project.

  3. Then clean maven and install maven.

2
votes

Go to the file location where the POM is stored and open cmd. Then type "mvn --v" to check the maven version and java runtime provided. Check runtime attribute and if it is "C:\Program Files\Java\jre1.8.0_191" or even close to a JRE, go to environment variables and add a new "system variable" called "JAVA_HOME" with a value "C:\Program Files\Java\jdk1.8.0_191".

Reopen the cmd and then "clean install" the project.

2
votes

I am not able to run my own build on the other suggestions here. I even tried different versions of maven-compiler-plugin: 3.1, 3.7.0, etc.

I made it work adding this:

<testSourceDirectory>/src/test/java</testSourceDirectory>

I tried this approach because it seems like the /src/test/java directory is considered a java class that is why it is compiled the same time as /src/test/java. So my hunch were right in my case.

Maybe it is to others too, so just try this one.

2
votes

I had the same problem, the solution was set JAVA_HOME in environment variables.

2
votes

Worked by adding this in pom.xml:

<properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
</properties>

Even you have SDK 13 or 14.

2
votes

<maven.compiler.release> (not source & target)

Several of the other Answers show <maven.compiler.source> & <maven.compiler.target>. Both of these are now supplanted by the simpler single element: <maven.compiler.release>.

<maven.compiler.release>15</maven.compiler.release>

So this:

  <!--old-school-->
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>15</maven.compiler.source>
    <maven.compiler.target>15</maven.compiler.target>
  </properties>

…becomes:

  <!--modern-->
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.release>15</maven.compiler.release>
  </properties>

See Question, “maven.compiler.release” as an replacement for source and target?

1
votes

The below pom.xml configuration is making the build successful and make sure project buildpath JRE System library should point to Java8.

org.apache.maven.pluginsmaven-compiler-plugin3.7.0 1.81.8

1
votes

Jdk 9 and 10 solution

<plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>${maven-compiler.version}</version>
            <configuration>
                <source>${java.version}</source>
                <target>${java.version}</target>
                <debug>true</debug>
            </configuration>
            <dependencies>
                <dependency>
                    <groupId>org.ow2.asm</groupId>
                    <artifactId>asm</artifactId>
                    <version>6.2</version>
                </dependency>
            </dependencies>
        </plugin>

and make sure your maven is pointing to JDK 10 or 9. mvn -v

Apache Maven 3.5.3 (3383c37e1f9e9b3bc3df5050c29c8aff9f295297; 2018-02-24T14:49:05-05:00)
Maven home: C:\devplay\apache-maven-3.5.3\bin\..
Java version: 10.0.1, vendor: Oracle Corporation
Java home: C:\Program Files\Java\jdk-10.0.1
Default locale: en_US, platform encoding: Cp1252
OS name: "windows 10", version: "10.0", arch: "amd64", family: "windows"
1
votes

Add the following in your pom.xml and do CTRL+S, it will automatically build the project.

<plugin> 
    <groupId>org.apache.maven.plugins</groupId> 
    <artifactId>maven-compiler-plugin</artifactId> 
    <version>3.5.1</version> 
    <configuration>
        <source>1.8</source> 
        <target>1.8</target> 
    </configuration> 
</plugin>

Now click on Run as >Maven Test.

This error will definitely get solved.

1
votes

Go to: File -> Project Structure -> Project -> Switch Project SDK & Project language level to Java version 1.8

Here is example:

enter image description here

0
votes

My issues was that I was running mvn compile from a child project directory instead of the parent project.

0
votes

For me it seemed to be all the answers on this page, plus the right JDK. I added the properties:

    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>

and the JDK 1.8 plug-in pointing to my open JDK from Redhat:

    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
            <fork>true</fork>
            <executable>C:\java\java-1.8.0-openjdk\bin\javac.exe</executable>
            <source>1.8</source>
            <target>1.8</target>
        </configuration>
    </plugin>

and ran

mvn clean verify

and got build success. Yay.

Edit: I think this is actually what made the difference: https://mkyong.com/eclipse/eclipse-ide-no-compiler-is-provided-in-this-environment-perhaps-you-are-running-on-a-jre-rather-than-a-jdk/

0
votes

In my case, I set the JAVA_HOME correctly but still had problem for hours! Finally I found out that I had settings.xml in .m2 directory and the java home was set there and pointed to another path. I ran the following command to find out what java path the maven is using:

mvn clean install -X | grep -i "executable"

Then I corrected the java home path in the settings.xml in .m2 directory and problem solved!