OutOfMemoryError

[puntogil]

hi
i get:

[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building less4j 1.17.2
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- antlr3-maven-plugin:3.5.2:antlr (run antlr) @ less4j ---
[INFO] ANTLR: Processing source directory ~/rpmbuild/BUILD/less4j-less4j-1.17.2/src/main/antlr3
ANTLR Parser Generator  Version 3.5.2
Output file ~/rpmbuild/BUILD/less4j-less4j-1.17.2/target/generated-sources/antlr3/com/github/sommeri/less4j/core/parser/LessParser.java does not exist: must build ~/rpmbuild/BUILD/less4j-less4j-1.17.2/src/main/antlr3/com/github/sommeri/less4j/core/parser/Less.g
com/github/sommeri/less4j/core/parser/Less.g
warning(200): com/github/sommeri/less4j/core/parser/Less.g:1531:19: 
Decision can match input such as "{NEW_LINE, WS}" using multiple alternatives: 1, 2

As a result, alternative(s) 2 were disabled for that input
warning(200): com/github/sommeri/less4j/core/parser/Less.g:1532:29: 
Decision can match input such as "{NEW_LINE, WS}" using multiple alternatives: 1, 2

As a result, alternative(s) 2 were disabled for that input
[INFO] 
[INFO] --- build-helper-maven-plugin:1.9.1:add-source (add-source) @ less4j ---
[INFO] Source directory: ~/rpmbuild/BUILD/less4j-less4j-1.17.2/target/generated-sources/antlr3 added.
[INFO] 
[INFO] --- maven-resources-plugin:2.7:resources (default-resources) @ less4j ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] Copying 2 resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.3:compile (default-compile) @ less4j ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 292 source files to ~/rpmbuild/BUILD/less4j-less4j-1.17.2/target/classes


The system is out of resources.
Consult the following stack trace for details.
java.lang.OutOfMemoryError: Java heap space
        at java.nio.HeapCharBuffer.<init>(HeapCharBuffer.java:57)
        at java.nio.CharBuffer.allocate(CharBuffer.java:335)
        at com.sun.tools.javac.util.BaseFileManager.decode(BaseFileManager.java:221)
        at com.sun.tools.javac.file.RegularFileObject.getCharContent(RegularFileObject.java:117)
        at com.sun.tools.javac.file.RegularFileObject.getCharContent(RegularFileObject.java:53)
        at com.sun.tools.javac.main.JavaCompiler.readSource(JavaCompiler.java:602)
        at com.sun.tools.javac.main.JavaCompiler.parse(JavaCompiler.java:665)
        at com.sun.tools.javac.main.JavaCompiler.parseFiles(JavaCompiler.java:950)
        at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:857)
        at com.sun.tools.javac.main.Main.compile(Main.java:523)
        at com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:129)
        at com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:138)
        at org.codehaus.plexus.compiler.javac.JavaxToolsCompiler.compileInProcess(JavaxToolsCompiler.java:125)
        at org.codehaus.plexus.compiler.javac.JavacCompiler.performCompile(JavacCompiler.java:170)
        at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:825)
        at org.apache.maven.plugin.compiler.CompilerMojo.execute(CompilerMojo.java:129)
        at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
        at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:862)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:286)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:197)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] An unknown compilation problem occurred
[INFO] 1 error

any ideas?
thanks in advance

Environment:

pache Maven 3.3.3 (NON-CANONICAL_2015-07-10T12:37:52_mockbuild; 2015-07-10T14:37:52+02:00)
Maven home: /usr/share/maven
Java version: 1.8.0_92, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.92-4.b14.fc23.i386/jre
Default locale: it_IT, platform encoding: UTF-8
OS name: "linux", version: "4.5.7-202.fc23.i686", arch: "i386", family: "unix"