解决办法：修改${JAVA_HOME}为绝对路径
 
C:/mine/software/Java/jdk1.8.0_171/lib/tools.jar

使用maven编译项目，失败了Could not find artifact jdk.tools:jdk.tools:jar:1.6 at specified path C:\Java/../lib/tools
 
查找所配置的jdk包中缺少tools.jar
 
检查所安装的其他版本jdk中的lib目录下是否有tools.jar,若有可在Eclipse中进行配置
 
Window–>Preferences–>Java–>Installed JREs中修改Installed JREs的路径，替换含有tools.jar的C:\Program Files\Java\jdk1.8.0_77路径配置使用
 
运行maven进行编译问题解决

       在做java JNI项目时，遇到了这样的错误，详情如下：
 
Unable to locate tools.jar. Expected to find it in /usr/lib/jvm/java-1.5.0-gcj-4.5/lib/tools.jar
 Buildfile: /home/dell/android-ndk-r6/samples/stringJnienv/build.xml
     [setup] Android SDK Tools Revision 12
     [setup] Project Target: Android 1.6
     [setup] API level: 4
     [setup] 
     [setup] ------------------
     [setup] Resolving library dependencies:
     [setup] No library dependencies.
     [setup] 
     [setup] ------------------
     [setup] 
     [setup] WARNING: No minSdkVersion value set. Application will install on all Android versions.
     [setup] 
     [setup] Importing rules file: tools/ant/main_rules.xml
 
 -debug-obfuscation-check:
 
 -set-debug-mode:
 
 -compile-tested-if-test:
 
 -pre-build:
 
 -dirs:
      [echo] Creating output directories if needed...
 
 -aidl:
      [echo] Compiling aidl files into Java classes...
 
 -renderscript:
      [echo] Compiling RenderScript files into Java classes and RenderScript bytecode...
 
 -resource-src:
      [echo] Generating R.java / Manifest.java from the resources...
 
 -pre-compile:
 
 compile:
     [javac] /home/dell/android-sdk-linux_x86/tools/ant/main_rules.xml:384: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds
     [javac] Compiling 1 source file to /home/dell/android-ndk-r6/samples/stringJnienv/bin/classes
 
 BUILD FAILED
 /home/dell/android-sdk-linux_x86/tools/ant/main_rules.xml:384: Unable to find a javac compiler;
 com.sun.tools.javac.Main is not on the classpath.
 Perhaps JAVA_HOME does not point to the JDK.
 It is currently set to "/usr/lib/jvm/java-1.5.0-gcj-4.5/jre"
 
 

 
 
电脑详情：
 
 
系统：ubuntu 11.4
 
处理器：AMD
 
开发环境JDK ：java-6-sun-1.6.0.26
 
 
运行环境JRE：sun-java6-jre
 

 
 

 
 
刚开始以为是  java-1.5.0-gcj-4.5有问题，就盲目的删除重装。然而，这些不起作用。
 
无奈之下，四处GOOGLE。终于找到了解决方法，如下：
 
           在终端输入命令：dell@ubuntu:/usr/lib/jvm/java-1.5.0-gcj-4.5$ sudo update-alternatives --config java
 
            显示如下信息：
 
           有 3 个候选项可用于替换 java (提供 /usr/bin/java)。
 
   选择       路径                                优先级  状态
 ------------------------------------------------------------
 * 0            /usr/bin/gij-4.5                       1045      自动模式
   1            /usr/bin/gij-4.4                       1044      手动模式
   2            /usr/bin/gij-4.5                       1045      手动模式
   3            /usr/lib/jvm/java-6-sun/jre/bin/java   63        手动模式
 
 要维持当前值[*]请按回车键，或者键入选择的编号：3
 update-alternatives: 使用 /usr/lib/jvm/java-6-sun/jre/bin/java 来提供 /usr/bin/java (java)，于 手动模式 中。
 
 
 
 
如上，我选择了3，然后就大功告成了。
 

 
 
究其原因，是java的默认jre选择错误，上面的操作也是用来更改默认jre的。
 
希望对大家有帮助！
 
如果认为好的话，请留言！谢谢！
 
 

 

在运行TOMCAT5.0时候由出现了如下的错误: 2005-11-17 19:38:47 StandardWrapperValve[action]: Servlet.service() for servlet action threw exception org.apache.jasper.JasperException: Unable to compile class for JSP Generated servlet error: C:/application/Tomcat 5.0/work/Catalina/localhost/mlinkweb/org/apache/jsp/layouts/layout_005findex_jsp.java:7: cannot access java.lang.Object Generated servlet error: bad class file: C:/application/Java/jdk1.5.0/jre/lib/rt.jar(java/lang/Object.class) class file has wrong version 49.0, should be 48.0 Please remove or make sure it appears in the correct subdirectory of the classpath. public final class layout_005findex_jsp extends org.apache.jasper.runtime.HttpJspBase ^ 1 error 最后在SUN的JAVA论坛里面找到了答案,只要将JDK1.5的LIB下面的TOOLS.JAR覆盖TOMCAT5.0目录/common/lib下面的tools.jar,然后重启TOMCAT5.0就可以了