嘗試讀取java中的txt文件時出現java.lang.NullPointerException

我不知道爲什麼我要得到npe，我可以讀取src/main/resources旁邊目錄中的其他文件。嘗試讀取java中的txt文件時出現java.lang.NullPointerException

它是一個基於maven的項目從日食運行。

有什麼想法？

的Java ..

StringBuilder sb = new StringBuilder(); 
try { 

    InputStream is = ShaderControl.class.getResourceAsStream("fragmentShader.txt"); 
    BufferedReader br = new BufferedReader(new InputStreamReader(is, "UTF-8")); 

    String line; 
    while ((line = br.readLine()) != null) { 

     sb.append(line); 
     sb.append('\n'); 
    } 
    is.close(); 

} catch (Exception e) { 
    e.printStackTrace(); 
} 
System.out.println("Shader is " + sb.toString());

控制檯輸出..

java.lang.NullPointerException 
    at java.io.Reader.<init>(Reader.java:90) 
    at java.io.InputStreamReader.<init>(InputStreamReader.java:119) 
    at justc0de.engine.tools.ShaderControl.loadShader(ShaderControl.java:36) 
    at justc0de.engine.ui.GameRenderer.init(GameRenderer.java:157) 
    at jogamp.opengl.GLDrawableHelper.init(GLDrawableHelper.java:640) 
    at jogamp.opengl.GLDrawableHelper.init(GLDrawableHelper.java:662) 
    at javax.media.opengl.awt.GLCanvas$9.run(GLCanvas.java:1366) 
    at jogamp.opengl.GLDrawableHelper.invokeGLImpl(GLDrawableHelper.java:1275) 
    at jogamp.opengl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:1131) 
    at javax.media.opengl.awt.GLCanvas$11.run(GLCanvas.java:1394) 
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:314) 
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:750) 
    at java.awt.EventQueue.access$300(EventQueue.java:115) 
    at java.awt.EventQueue$3.run(EventQueue.java:711) 
    at java.awt.EventQueue$3.run(EventQueue.java:709) 
    at java.security.AccessController.doPrivileged(AccessController.java:311) 
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:88) 
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:720) 
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:254) 
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:173) 
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:162) 
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:158) 
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:150) 
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:103) 
Shader is 
Program link error:

目錄列表..

[email protected]:~/git/justc0de$ ls src/main/resources/*.txt 
src/main/resources/fragmentShader.txt src/main/resources/vertexShader.txt

來源

2015-03-31 bobbyrne01

磁盤上的文件名中是否存在尾隨空格？你確定發佈的源代碼是你正在執行的？資源目錄是否在您的類路徑中？ – Bohemian 2015-03-31 23:22:08

發現了它本來應該..

InputStream is = ShaderControl.class.getResourceAsStream("/fragmentShader.txt");

來源

2015-03-31 23:23:12 bobbyrne01

嘗試讀取java中的txt文件時出現java.lang.NullPointerException

回答

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