Android問題集錦轉載之三:Javah 常見錯誤記錄-NDK與JNI除錯
阿新 • • 發佈:2018-12-22
測試檔案:hello-jni/src/com/example/hellojni/HelloJni.java
/** * 該檔案來自 Android NDK Sample - HelloJni, 為了便於說明問題,我作了一些修改。 */ package com.example.hellojni; public class HelloJni { public native String stringFromJNI(); public native String unimplementedStringFromJNI(); static { System.loadLibrary("hello-jni"); } }
錯誤一
[email protected]:hellojni$ javac HelloJni.java [email protected]:hellojni$ ls Hello.class Hello.h Hello.java HelloJni.class HelloJni.java [email protected]:hellojni$ javah -jni HelloJni error: cannot access HelloJni bad class file: ./HelloJni.class class file contains wrong class: com.example.hellojni.HelloJni Please remove or make sure it appears in the correct subdirectory of the classpath. com.sun.tools.javac.util.Abort at com.sun.tools.javac.comp.Check.completionError(Check.java:164) at com.sun.tools.javadoc.DocEnv.loadClass(DocEnv.java:149) at com.sun.tools.javadoc.RootDocImpl.<init>(RootDocImpl.java:77) at com.sun.tools.javadoc.JavadocTool.getRootDocImpl(JavadocTool.java:159) at com.sun.tools.javadoc.Start.parseAndExecute(Start.java:330) at com.sun.tools.javadoc.Start.begin(Start.java:128) at com.sun.tools.javadoc.Main.execute(Main.java:66) at com.sun.tools.javah.Main.main(Main.java:147) javadoc: error - fatal error 2 errors
錯誤原因,沒有在正確的路徑下執行 javah 命令,應該在原始碼根目錄下執行。
錯誤二:
[email protected]:hellojni$ cd ../../../ [email protected]:src$ ls com [email protected]:src$ javah -jni HelloJni error: cannot access HelloJni class file for HelloJni not found javadoc: error - Class HelloJni not found. Error: No classes were specified on the command line. Try -help.
錯誤原因:Classes 引數要使用完整類名,也就是說要加上包名
錯誤四:
[email protected]:src$ javah -jni com/example/hellojni/HelloJni javadoc: error - Illegal package name: "com/example/hellojni/HelloJni" 1 error
錯誤原因:完整類名格式錯誤
[email protected]:src$ javah -jni com.example.hellojni.HelloJni
OK,編譯通過。
如果還有錯誤,說是類找不到還是什麼的,請嘗試新增 -classpath . 引數。如下:
[email protected]:src$ javah -jni -classpath . com.example.hellojni.HelloJni