Voilà les logs après avoir installe un nouveau Eclipse en 64 bits et les JRE et JDK que tu m'a conseillé:
[INFO] Scanning for projects...
[INFO]
[INFO] Using the builder org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder with a thread count of 1
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building minecraft-launcher 1.0.1
[INFO] ------------------------------------------------------------------------
[INFO] Downloading: http://repo.maven.apache.org/maven2...lugin/2.12.4/maven-surefire-plugin-2.12.4.pom
[INFO] Downloaded: http://repo.maven.apache.org/maven2...lugin/2.12.4/maven-surefire-plugin-2.12.4.pom (11 KB at 11.5 KB/sec)
[INFO] Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/surefire/surefire/2.12.4/surefire-2.12.4.pom
[INFO] Downloaded: http://repo.maven.apache.org/maven2/org/apache/maven/surefire/surefire/2.12.4/surefire-2.12.4.pom (14 KB at 105.2 KB/sec)
[INFO] Downloading: http://repo.maven.apache.org/maven2...maven-jar-plugin/2.4/maven-jar-plugin-2.4.pom
[INFO] Downloaded: http://repo.maven.apache.org/maven2...maven-jar-plugin/2.4/maven-jar-plugin-2.4.pom (6 KB at 47.9 KB/sec)
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ minecraft-launcher ---
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 2 resources
[INFO]
[INFO] --- maven-compiler-plugin:2.5.1:compile (default-compile) @ minecraft-launcher ---
[WARNING] File encoding has not been set, using platform encoding Cp1252, i.e. build is platform dependent!
[INFO] Compiling 6 source files to C:\Users\Flavien\Desktop\Minecraft Modding\Source 1.3.5\minecraft-launcher\target\classes
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 5.234 s
[INFO] Finished at: 2014-07-08T15:30:51+01:00
[INFO] Final Memory: 10M/112M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.5.1:compile (default-compile) on project minecraft-launcher: Fatal error compiling: tools.jar not found: C:\Program Files\Java\jre7\..\lib\tools.jar -> [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/MojoExecutionException
[INFO] Scanning for projects...
[INFO]
[INFO] Using the builder org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder with a thread count of 1
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building minecraft-launcher 1.0.1
[INFO] ------------------------------------------------------------------------
[INFO] Downloading: http://repo.maven.apache.org/maven2...lugin/2.12.4/maven-surefire-plugin-2.12.4.pom
[INFO] Downloaded: http://repo.maven.apache.org/maven2...lugin/2.12.4/maven-surefire-plugin-2.12.4.pom (11 KB at 11.5 KB/sec)
[INFO] Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/surefire/surefire/2.12.4/surefire-2.12.4.pom
[INFO] Downloaded: http://repo.maven.apache.org/maven2/org/apache/maven/surefire/surefire/2.12.4/surefire-2.12.4.pom (14 KB at 105.2 KB/sec)
[INFO] Downloading: http://repo.maven.apache.org/maven2...maven-jar-plugin/2.4/maven-jar-plugin-2.4.pom
[INFO] Downloaded: http://repo.maven.apache.org/maven2...maven-jar-plugin/2.4/maven-jar-plugin-2.4.pom (6 KB at 47.9 KB/sec)
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ minecraft-launcher ---
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 2 resources
[INFO]
[INFO] --- maven-compiler-plugin:2.5.1:compile (default-compile) @ minecraft-launcher ---
[WARNING] File encoding has not been set, using platform encoding Cp1252, i.e. build is platform dependent!
[INFO] Compiling 6 source files to C:\Users\Flavien\Desktop\Minecraft Modding\Source 1.3.5\minecraft-launcher\target\classes
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 5.234 s
[INFO] Finished at: 2014-07-08T15:30:51+01:00
[INFO] Final Memory: 10M/112M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.5.1:compile (default-compile) on project minecraft-launcher: Fatal error compiling: tools.jar not found: C:\Program Files\Java\jre7\..\lib\tools.jar -> [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/MojoExecutionException