http://livingash.wordpress.com/2007/08/16/struts-2-and-sun-micros-toolsjar-in-eclipse-wtp/
The configuration free classic way to start Eclipse with desired VM.
$>eclipse -vm "C:\Program Files\Java\jdk1.6.0_01\bin"
这个问题一般是由于使用了struts2引起的：
用了m2eclipse 插件后，使用struts2时，需要依赖 com.sun 的 default-tools.jar，见pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>cn.tianxing.gehouse.admin</groupId>
<artifactId>admin.gehouse.cn</artifactId>
<name>admin.gehouse.cn</name>
<version>0.0.1</version>
<description>admin.gehouse.cn</description>
<url>http://admin.gehouse.cn</url>
<issueManagement>
<system>jira</system>
<url>http://jira.gehouse.cn:8080/BrowseProject.jspa?id=10000</url>
</issueManagement>
<ciManagement>
<system>continuum</system>
<url>http://ci.gehouse.cn:8090/continuum</url>
<notifiers>
<notifier>
<type>msn</type>
<sendOnSuccess>false</sendOnSuccess>
<sendOnWarning>false</sendOnWarning>
<configuration>
<address>kylindai@hotmail.com</address>
</configuration>
</notifier>
<notifier>
<type>msn</type>
<sendOnSuccess>false</sendOnSuccess>
<sendOnWarning>false</sendOnWarning>
<configuration>
<address>larrin2002@msn.com</address>
</configuration>
</notifier>
<notifier>
<type>msn</type>
<sendOnSuccess>false</sendOnSuccess>
<sendOnWarning>false</sendOnWarning>
<configuration>
<address>manjingtou-ren@hotmail.com</address>
</configuration>
</notifier>
</notifiers>
</ciManagement>
<inceptionYear>2007-05</inceptionYear>
<developers>
<developer>
<name>kylin.dai</name>
<email>kylin.dai@gehouse.cn</email>
</developer>
<developer>
<name>larrin.luo</name>
<email>larrin.luo@gehouse.cn</email>
</developer>
<developer>
<name>jason.ren</name>
<email>jason.ren@gehouse.cn</email>
</developer>
</developers>
<scm>
<connection>scm:svn:svn://svn.gehouse.cn/sandbox/kylin/admin.gehouse.cn/trunk</connection>
</scm>
<organization>
<name>gehouse.cn</name>
<url>http://www.gehouse.cn</url>
</organization>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.0.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
</plugins>
</build>
<profiles>
<profile>
<id>default-tools.jar</id>
<activation>
<property>
<name>java.vendor</name>
<value>Sun Microsystems Inc.</value>
</property>
</activation>
<dependencies>
<dependency>
<groupId>com.sun</groupId>
<artifactId>tools</artifactId>
<version>1.5.0</version>
<scope>system</scope>
<systemPath>${java.home}/../lib/tools.jar</systemPath>
</dependency>
</dependencies>
</profile>
</profiles>
<dependencies>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.14</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>dom4j</groupId>
<artifactId>dom4j</artifactId>
<version>1.6.1</version>
</dependency>
<dependency>
<groupId>com.ibatis</groupId>
<artifactId>ibatis</artifactId>
<version>2.3.0.667</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.0.5</version>
</dependency>
<dependency>
<groupId>org.extremecomponents</groupId>
<artifactId>extremecomponents</artifactId>
<version>1.0.1</version>
</dependency>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.2.1</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring</artifactId>
<version>2.0.5</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-mock</artifactId>
<version>2.0.5</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>2.0.5</version>
</dependency>
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts2-core</artifactId>
<version>2.0.6</version>
</dependency>
</dependencies>
<reporting>
<plugins>
<plugin>
<artifactId>maven-changelog-plugin</artifactId>
</plugin>
<plugin>
<artifactId>maven-checkstyle-plugin</artifactId>
</plugin>
<plugin>
<artifactId>maven-pmd-plugin</artifactId>
</plugin>
<plugin>
<artifactId>maven-changes-plugin</artifactId>
<reportSets>
<reportSet>
<reports>
<report>jira-report</report>
</reports>
</reportSet>
</reportSets>
</plugin>
</plugins>
</reporting>
</project>
这个pom.xml 在eclipse里加载的时候总是报告：
Missing:
1) com.sun:tools:jar:1.4.2
Try downloading the file manually from the project website.
Then, install it using the command:
mvn install:install-file -DgroupId=com.sun -DartifactId=tools "
-Dversion=1.4.2 -Dpackaging=jar -Dfile=/path/to/file
Path to dependency:
原来，是${java.home}在作怪，eclipse 没有使用 JAVA_HOME
默认，eclipse 使用 C:"windows"system32"javaw.exe 作为 JVM，当然找不到tools.jar
解决方法如下：
修改 eclipse.exe 目录下的 eclipse.ini 指定vm，加入红色黑体字部分，注意 -vm后面不能有空格。
-vm
D:"Program Files"Java"jdk1.6.0_01"bin"javaw.exe
-vmargs
-Xms128m
-Xmx512m
再次启动 eclipse，问题解决。
上面的pom.xml文件，也是一个 Mavne2 & Continuum 的例子，由我写的 Maven2 &
Continuum 持续整合 (3)，发布时，网络故障丢失了，也不打算重新再写一篇了，上述的pom.xml，可以在continuum的 add
maven2 projects 里，添加使用，设好 scheduler，可以设1小时 build 一次，半小时 test 一次，等不同的任务