How do you specify the Java compiler version in a pom xml file

Question

I wrote some Maven code in Netbeans that has approximately more than 2000 lines  When I compile it on Netbeans  everything is fine  but if I want to run it on command line  I will get these errors  generics are not supported in -source 1 3  use -source 5 or higher to enable generics          ArrayList lt ArrayList lt Integer gt  gt  list   new ArrayList lt ArrayList lt Integer gt  gt      generics are not supported in -source 1 3  use -source 5 or higher to enable generics          HashSet lt Double gt  resid List   new HashSet lt Double gt  Arrays asList resid val     generics are not supported in -source 1 3  use -source 5 or higher to enable generics          List lt Integer gt  ind ovlpList   new ArrayList lt Integer gt  Arrays asList ind ovlp     generics are not supported in -source 1 3  use -source 5 or higher to enable generics  public class ColumnComparator implements Comparator lt double   gt     annotations are not supported in -source 1 3  use -source 5 or higher to enable annotations   Override  I tried to use Java 1 3 1  compiler errors  but I got more errors  I found from other posts that I should modify pom xml  but I do not know how  Here is my pom xml  lt project xmlns  quot http   maven apache org POM 4 0 0 quot  xmlns xsi  quot http   www w3 org 2001 XMLSchema-instance quot    xsi schemaLocation  quot http   maven apache org POM 4 0 0 http   maven apache org xsd maven-4 0 0 xsd quot  gt     lt modelVersion gt 4 0 0 lt  modelVersion gt      lt groupId gt com mycompany lt  groupId gt     lt artifactId gt mavenmain lt  artifactId gt      lt version gt 1 0-SNAPSHOT lt  version gt      lt packaging gt jar lt  packaging gt       lt name gt mavenmain lt  name gt       lt url gt http   maven apache org lt  url gt       lt properties gt        lt project build sourceEncoding gt UTF-8 lt  project build sourceEncoding gt       lt  properties gt       lt dependencies gt        lt dependency gt          lt groupId gt junit lt  groupId gt           lt artifactId gt junit lt  artifactId gt          lt version gt 3 8 1 lt  version gt          lt scope gt test lt  scope gt        lt  dependency gt        lt dependency gt           lt groupId gt gov nist math lt  groupId gt           lt artifactId gt jama lt  artifactId gt           lt version gt 1 0 2 lt  version gt        lt  dependency gt      lt  dependencies gt    lt  project gt   It would be great if you can help me

User · Answer

I faced same issue in eclipse neon simple maven java project

But I add below details inside pom.xml file

   <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.6.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

After right click on project > maven > update project (checked force update)

Its resolve me to display error on project

Hope it's will helpful

Thansk

User · Answer

maven-compiler-plugin it s already present in plugins hierarchy dependency in pom xml  Check in Effective POM  For short you can use properties like this   lt properties gt      lt maven compiler source gt 1 8 lt  maven compiler source gt      lt maven compiler target gt 1 8 lt  maven compiler target gt   lt  properties gt   I m using Maven 3 2 5

User · Answer

lt plugin gt               lt groupId gt org apache maven plugins lt  groupId gt               lt artifactId gt maven-compiler-plugin lt  artifactId gt               lt version gt 3 3 lt  version gt               lt configuration gt                   lt fork gt true lt  fork gt                   lt source gt 1 8 lt  source gt                   lt target gt 1 8 lt  target gt               lt  configuration gt           lt  plugin gt

User · Answer

Generally you don t want to value only the source version  javac -source 1 8 for example  but you want to value both the source and the target version  javac -source 1 8 -target 1 8 for example   Note that from Java 9  you have a way to convey both information and in a more robust way for cross-compilation compatibility  javac -release 9   Maven that wraps the javac command provides multiple ways to convey all these JVM standard options  How to specify the JDK version  Using maven-compiler-plugin or maven compiler source maven compiler target properties to specify the source and the target are equivalent   lt plugins gt       lt plugin gt               lt artifactId gt maven-compiler-plugin lt  artifactId gt           lt configuration gt               lt source gt 1 8 lt  source gt               lt target gt 1 8 lt  target gt           lt  configuration gt       lt  plugin gt   lt  plugins gt   and  lt properties gt       lt maven compiler source gt 1 8 lt  maven compiler source gt       lt maven compiler target gt 1 8 lt  maven compiler target gt   lt  properties gt   are equivalent according to the Maven documentation of the compiler plugin since the  lt source gt  and the  lt target gt  elements in the compiler configuration use the properties maven compiler source and maven compiler target if they are defined   source   The -source argument for the Java compiler  Default value is  1 6  User property is  maven compiler source    target   The -target argument for the Java compiler  Default value is  1 6  User property is  maven compiler target   About the default values  for source and  target  note that since the 3 8 0 of the maven compiler  the default values have changed from 1 5 to 1 6   lt release gt  tag     new way to specify Java version in maven-compiler-plugin 3 6 You can use the release argument     lt plugin gt       lt groupId gt org apache maven plugins lt  groupId gt       lt artifactId gt maven-compiler-plugin lt  artifactId gt       lt version gt 3 8 0 lt  version gt       lt configuration gt           lt release gt 9 lt  release gt       lt  configuration gt   lt  plugin gt   You could also declare just the user property maven compiler release   lt properties gt       lt maven compiler release gt 9 lt  maven compiler release gt   lt  properties gt   But at this time the last one will not be enough as the maven-compiler-plugin default version you use doesn t rely on a recent enough version  The Maven release argument conveys  release to the Java compiler to access the JVM standard option newly added to Java 9  JEP 247  Compile for Older Platform Versions   Compiles against the public  supported and documented API for a specific VM version   This way provides a standard way to specify the same version for the source  the target and the bootstrap JVM options  Note that specifying the bootstrap is a good practice for cross compilations and it will not hurt if you don t make cross compilations either  Which is the best way to specify the JDK version  Java 8 and below Neither maven compiler source maven compiler target properties or using the maven-compiler-plugin is better  It changes nothing in the facts since finally the two ways rely on the same properties and the same mechanism   the maven core compiler plugin  Well  if you don t need to specify other properties or behavior than Java versions in the compiler plugin  using this way makes more sense as this is more concise   lt properties gt       lt maven compiler source gt 1 8 lt  maven compiler source gt       lt maven compiler target gt 1 8 lt  maven compiler target gt   lt  properties gt   Java 9 and later The release argument  third point  is a way to strongly consider if you want to use the same version for the source and the target

User · Answer

lt project gt             lt build gt                 lt plugins gt         lt plugin gt           lt groupId gt org apache maven plugins lt  groupId gt           lt artifactId gt maven-compiler-plugin lt  artifactId gt           lt version gt  whatever version is current  lt  version gt           lt configuration gt             lt  -- or whatever version you use -- gt             lt source gt 1 7 lt  source gt             lt target gt 1 7 lt  target gt           lt  configuration gt         lt  plugin gt       lt  plugins gt               lt  build gt           lt  project gt    See the config page for the maven compiler plugin   http   maven apache org plugins maven-compiler-plugin examples set-compiler-source-and-target html  Oh  and  don t use Java 1 3 x  current versions are Java 1 7 x or 1 8 x

[java] How do you specify the Java compiler version in a pom.xml file?

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