title: minecraft forge gradle "runClient" Exception
body: <p>I should install minecraft forge.
  I write gradle command.</p>
  <pre><code>gradlew setupDecompWorkspace
  gradlew eclipse
  </code></pre>
  <p>This command is run well.</p>
  <p>But next command is not working</p>
  <pre><code>gradlew runClient
  </code></pre>
  <p>This is exception of  command.</p>
  <pre><code>java.lang.reflect.InvocationTargetException: null
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_242]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   ~[?:1.8.0_242]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   ~[?:1.8.0_242]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_242]
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_242]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   ~[?:1.8.0_242]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   ~[?:1.8.0_242]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_242]
    at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97)
   [start/:?]
    at GradleStart.main(GradleStart.java:25) [start/:?]
  Caused by: java.lang.ExceptionInInitializerError
    at net.minecraft.client.Minecraft.getSystemTime(Minecraft.java:3159)
   ~[Minecraft.class:?]
    at net.minecraft.client.main.Main.main(Main.java:42) ~[Main.class:?]
     ... 12 more
  Caused by: java.lang.NullPointerException
    at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1847) ~[?:1.8.0_242]
    at java.lang.Runtime.loadLibrary0(Runtime.java:871) ~[?:1.8.0_242]
    at java.lang.System.loadLibrary(System.java:1124) ~[?:1.8.0_242]
    at org.lwjgl.Sys$1.run(Sys.java:72) ~[lwjgl-2.9.4-nightly-20150209.jar:?]
    at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_242]
    at org.lwjgl.Sys.doLoadLibrary(Sys.java:66) ~[lwjgl-2.9.4-nightly-20150209.jar:?]
    at org.lwjgl.Sys.loadLibrary(Sys.java:87) ~[lwjgl-2.9.4-nightly-20150209.jar:?]
    at org.lwjgl.Sys.&lt;clinit&gt;(Sys.java:117) ~[lwjgl-2.9.4-nightly-20150209.jar:?]
    at net.minecraft.client.Minecraft.getSystemTime(Minecraft.java:3159)
   ~[Minecraft.class:?]
    at net.minecraft.client.main.Main.main(Main.java:42) ~[Main.class:?]
    ... 12 more
  Exception in thread &quot;main&quot; [07:55:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:
   java.lang.reflect.InvocationTargetException
  [07:55:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:        at
   sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  [07:55:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:
          at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      [07:55:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:        at
   sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
       [07:55:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:        at
   java.lang.reflect.Method.invoke(Method.java:498)
       [07:55:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:        at
  net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97)
       [07:55:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1052]:        at
   GradleStart.main(GradleStart.java:25)
       [07:55:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]: Caused by:
   net.minecraftforge.fml.relauncher.FMLSecurityManager$ExitTrappedException
       [07:55:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:        at
   net.minecraftforge.fml.relauncher.FMLSecurityManager.checkPermission(FMLSecurityManager.java:49)
       [07:55:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:        at
   java.lang.SecurityManager.checkExit(SecurityManager.java:761)
       [07:55:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:        at
   java.lang.Runtime.exit(Runtime.java:108)
       [07:55:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:        at
   java.lang.System.exit(System.java:973)
       [07:55:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:        at
   net.minecraft.launchwrapper.Launch.launch(Launch.java:138)
       [07:55:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:        at
   net.minecraft.launchwrapper.Launch.main(Launch.java:28)
       [07:55:11] [main/INFO] [STDERR]: [java.lang.ThreadGroup:uncaughtException:1061]:        ... 6 more
       :runClient FAILED
       
       FAILURE: Build failed with an exception.
       
       * What went wrong:
       Execution failed for task ':runClient'.
       &gt; Process 'command 'C:\Program Files\ojdkbuild\java-1.8.0-openjdk-1.8.0.242-1\bin\java.exe'' finished with non-zero exit value 1
       
       * Try:
       Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
       
       BUILD FAILED
       
       Total time: 9.208 secs
  
  What can I do??
  
  Also gradlew build is well.
  </code></pre>