我在控制面板的"系统"中找到了环境变量,并创建了两个新变量,一个用于用户变量,另一个用于系统变量.两者都被命名为JAVA_HOME,两者都指向
C:\太阳\ SDK\JDK\BIN
但由于某种原因,我在运行Java命令时仍会遇到以下错误...
BUILD FAILED
C:\Users\Derek\Desktop\eclipse\eclipse\glassfish\setup.xml:161: The following error occurred while executing this line:
C:\Users\Derek\Desktop\eclipse\eclipse\glassfish\setup.xml:141: The following error occurred while executing this line:
C:\Users\Derek\Desktop\eclipse\eclipse\glassfish\setup.xml:137: Please set java.home to a JDK installation
Total time: 1 second
C:\Users\Derek\Desktop\eclipse\eclipse\glassfish>lib\ant\bin\ant -f setup.xml
Unable to locate tools.jar. Expected to find it in C:\Program Files\Java\jre6\lib\tools.jar
Buildfile: setup.xml
我该如何解决这个问题？
当我跑蚂蚁时,它说:
Unable to locate tools.jar. Expected to find it in C:\Program Files\Java\jre6\lib\tools.jar
Buildfile: build.xml does not exist!
Build failed
我可以用什么软件包下载所需的文件> C:\ Program Files\Java\jre6\lib\tools.jar
我刚刚下载了这个:
JRE-6u19-Windows的i586系统,s.exe
但遗憾的是它似乎不在它上面......
当我尝试在由Servlet(java页面),JSP,bean(java页面)和HTML页面组成的Netbeans中运行我的Java EE程序时,我在输出中出现此错误:
In-place deployment at C:\Users\Derek\Documents\NetBeansProjects\EJBProject\EJBProject-war\build\web
Initializing...
deploy?path=C:\Users\Derek\Documents\NetBeansProjects\EJBProject\EJBProject-war\build\web&name=EJBProject-war&force=true failed on Personal GlassFish v3 Domain
C:\Users\Derek\Documents\NetBeansProjects\EJBProject\EJBProject-war\nbproject\build-impl.xml:611: The module has not been deployed.
BUILD FAILED (total time: 1 second)
然后在命令提示符下,当我asant run在相应的目录中运行时,我得到:
C:\用户\德里克\文件\的NetBeansProjects\EJBProject \nbproject文件\ build-impl.xml中:19:类org.apache.tools.ant.taskdefs.condition.Not不支持嵌套 "antversion" 元素.
你知道为什么会这样吗？为什么netbeans不会部署我的应用程序,所以我可以运行并测试它？
编辑:蚂蚁版实际上想出了......
Apache Ant版本1.6.5于2005年6月2日编译
glassfish输出日志说:
SEVERE: Exception while loading the app
java.lang.RuntimeException: EJB Container initialization error
at org.glassfish.ejb.startup.EjbApplication.loadContainers(EjbApplication.java:219)
at org.glassfish.ejb.startup.EjbDeployer.load(EjbDeployer.java:197)
at org.glassfish.ejb.startup.EjbDeployer.load(EjbDeployer.java:63)
at org.glassfish.internal.data.ModuleInfo.load(ModuleInfo.java:175)
at org.glassfish.internal.data.ApplicationInfo.load(ApplicationInfo.java:216)
at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:338)
at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:183)
at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:272)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$1.execute(CommandRunnerImpl.java:305)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:320)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1176)
at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$900(CommandRunnerImpl.java:83)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1235)
at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1224) …我必须从表中的一列中获取测试分数的中位数、众数和范围，但我不确定如何去做。当您使用 java 连接到数据库时，通常会返回一个结果集，您可以用它制作表格或其他内容，但是如何获取特定的数字或数字？是否有 SQL 命令来获取中位数/众数/范围，或者我必须自己计算这个，以及如何从表中提取数字以便能够计算众数/中位数/范围？
谢谢。