那些遇到过的问题

在ant脚本中包含外部JAR时出错

mee*_*shi 3 java ant

这是我编写ANT脚本的第一次尝试.这是使用Spring的简单Hello World应用程序的build.xml.

<project name="MyFirstApp" default="jar" basedir="..">  
    <property name="src" location="src"/>
    <property name="build" location="build"/>
    <property name="lib" location="/WebContent/WEB-INF/lib"/>   
    <path id="classpath-example">   
        <fileset dir="${build}" includes="*.jar"/>
    </path>
    <target name="clean">
        <delete dir="build"/>
    </target>
    <target name="compile">
        <mkdir dir="build/classes"/>
        <javac srcdir="${src}" destdir="build/classes" includeantruntime="false"/>
        <classpath refid="classpath-example"/>
    </target>
    <target name="jar">
        <mkdir dir="build/jar"/>
        <jar destfile="build/jar/MyFirstApp.jar" basedir="build/classes"/>          
    </target>
    <target name="run">
        <java jar="build/jar/MyFirstApp.jar" fork="true"/>
    </target>
</project>
Run Code Online (Sandbox Code Playgroud)

当我尝试运行此时,将显示以下错误消息.

问题:无法创建任务或键入类路径原因:名称未定义.行动:检查拼写.操作:检查是否已声明任何自定义任务/类型.操作:检查是否已发生任何/声明.

有人可以告诉我该怎么办？

我第一次运行ANT脚本时,生成了JAR文件.当我再次尝试运行它时,它会给出下面提到的错误.

clean:[delete]删除目录F:\ shil\JAVA\Spring Workspace\myfirstapp1\build

compile:
     [echo] compiling
    [mkdir] Created dir: F:\shil\JAVA\Spring Workspace\myfirstapp1\build\classes

    [javac] Compiling 5 source files to F:\shil\JAVA\Spring Workspace\myfirstapp
1\build\classes
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Hello
WorldServlet.java:4: package javax.servlet does not exist
    [javac] import javax.servlet.ServletException;
    [javac]                     ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Hello
WorldServlet.java:5: package javax.servlet.http does not exist
    [javac] import javax.servlet.http.HttpServlet;
    [javac]                          ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Hello
WorldServlet.java:6: package javax.servlet.http does not exist
    [javac] import javax.servlet.http.HttpServletRequest;
    [javac]                          ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Hello
WorldServlet.java:7: package javax.servlet.http does not exist
    [javac] import javax.servlet.http.HttpServletResponse;
    [javac]                          ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Hello
WorldServlet.java:12: cannot find symbol
    [javac] symbol: class HttpServlet
    [javac] public class HelloWorldServlet extends HttpServlet {
    [javac]                                        ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Hello
WorldServlet.java:26: cannot find symbol
    [javac] symbol  : class HttpServletRequest
    [javac] location: class my.hello.servlet.HelloWorldServlet
    [javac]     protected void doGet(HttpServletRequest request, HttpServletResp
onse response) throws ServletException, IOException {
    [javac]                          ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Hello
WorldServlet.java:26: cannot find symbol
    [javac] symbol  : class HttpServletResponse
    [javac] location: class my.hello.servlet.HelloWorldServlet
    [javac]     protected void doGet(HttpServletRequest request, HttpServletResp
onse response) throws ServletException, IOException {
    [javac]                                                      ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Hello
WorldServlet.java:26: cannot find symbol
    [javac] symbol  : class ServletException
    [javac] location: class my.hello.servlet.HelloWorldServlet
    [javac]     protected void doGet(HttpServletRequest request, HttpServletResp
onse response) throws ServletException, IOException {
    [javac]
                      ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Hello
WorldServlet.java:33: cannot find symbol
    [javac] symbol  : class HttpServletRequest
    [javac] location: class my.hello.servlet.HelloWorldServlet
    [javac]     protected void doPost(HttpServletRequest request, HttpServletRes
ponse response) throws ServletException, IOException {
    [javac]                           ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Hello
WorldServlet.java:33: cannot find symbol
    [javac] symbol  : class HttpServletResponse
    [javac] location: class my.hello.servlet.HelloWorldServlet
    [javac]     protected void doPost(HttpServletRequest request, HttpServletRes
ponse response) throws ServletException, IOException {
    [javac]                                                       ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Hello
WorldServlet.java:33: cannot find symbol
    [javac] symbol  : class ServletException
    [javac] location: class my.hello.servlet.HelloWorldServlet
    [javac]     protected void doPost(HttpServletRequest request, HttpServletRes
ponse response) throws ServletException, IOException {
    [javac]
                       ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Welco
meServlet.java:4: package javax.servlet does not exist
    [javac] import javax.servlet.RequestDispatcher;
    [javac]                     ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Welco
meServlet.java:5: package javax.servlet does not exist
    [javac] import javax.servlet.ServletException;
    [javac]                     ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Welco
meServlet.java:6: package javax.servlet.http does not exist
    [javac] import javax.servlet.http.HttpServlet;
    [javac]                          ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Welco
meServlet.java:7: package javax.servlet.http does not exist
    [javac] import javax.servlet.http.HttpServletRequest;
    [javac]                          ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Welco
meServlet.java:8: package javax.servlet.http does not exist
    [javac] import javax.servlet.http.HttpServletResponse;
    [javac]                          ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Welco
meServlet.java:15: cannot find symbol
    [javac] symbol: class HttpServlet
    [javac] public class WelcomeServlet extends HttpServlet {
    [javac]                                     ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Welco
meServlet.java:29: cannot find symbol
    [javac] symbol  : class HttpServletRequest
    [javac] location: class my.hello.servlet.WelcomeServlet
    [javac]     protected void doGet(HttpServletRequest request, HttpServletResp
onse response) throws ServletException, IOException {
    [javac]                          ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Welco
meServlet.java:29: cannot find symbol
    [javac] symbol  : class HttpServletResponse
    [javac] location: class my.hello.servlet.WelcomeServlet
    [javac]     protected void doGet(HttpServletRequest request, HttpServletResp
onse response) throws ServletException, IOException {
    [javac]                                                      ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Welco
meServlet.java:29: cannot find symbol
    [javac] symbol  : class ServletException
    [javac] location: class my.hello.servlet.WelcomeServlet
    [javac]     protected void doGet(HttpServletRequest request, HttpServletResp
onse response) throws ServletException, IOException {
    [javac]
                      ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Welco
meServlet.java:36: cannot find symbol
    [javac] symbol  : class HttpServletRequest
    [javac] location: class my.hello.servlet.WelcomeServlet
    [javac]     protected void doPost(HttpServletRequest request, HttpServletRes
ponse response) throws ServletException, IOException {
    [javac]                           ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Welco
meServlet.java:36: cannot find symbol
    [javac] symbol  : class HttpServletResponse
    [javac] location: class my.hello.servlet.WelcomeServlet
    [javac]     protected void doPost(HttpServletRequest request, HttpServletRes
ponse response) throws ServletException, IOException {
    [javac]                                                       ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Welco
meServlet.java:36: cannot find symbol
    [javac] symbol  : class ServletException
    [javac] location: class my.hello.servlet.WelcomeServlet
    [javac]     protected void doPost(HttpServletRequest request, HttpServletRes
ponse response) throws ServletException, IOException {
    [javac]
                       ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Welco
meServlet.java:41: cannot find symbol
    [javac] symbol  : class RequestDispatcher
    [javac] location: class my.hello.servlet.WelcomeServlet
    [javac]             RequestDispatcher welcomeDispatcher = getServletContext(
).getRequestDispatcher("/Welcome.jsp");
    [javac]             ^
    [javac] F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\servlet\Welco
meServlet.java:41: cannot find symbol
    [javac] symbol  : method getServletContext()
    [javac] location: class my.hello.servlet.WelcomeServlet
    [javac]             RequestDispatcher welcomeDispatcher = getServletContext(
).getRequestDispatcher("/Welcome.jsp");
    [javac]                                                   ^
    [javac] Note: F:\shil\JAVA\Spring Workspace\myfirstapp1\src\my\hello\HelloWo
rldApp.java uses or overrides a deprecated API.
    [javac] Note: Recompile with -Xlint:deprecation for details.
    [javac] 25 errors

BUILD FAILED
F:\shil\JAVA\Spring Workspace\myfirstapp1\ant\build.xml:19: Compile failed; see
the compiler error output for details.

Total time: 1 second
Run Code Online (Sandbox Code Playgroud)

为什么这不是第一次发生？有人可以帮忙吗？

dty*_*dty 5

在<classpath>你的内部compile目标应该嵌套的内部<javac>元素.

值得注意的是,ant(以及大多数构建系统)的很多功能来自于声明目标之间的依赖关系.在你的例子中,在jar没有先运行目标的情况下运行目标没有任何意义compile,否则,没有类文件可以用于jar - 或者更糟糕的是,你将jar手动运行,但忘记先运行compile并最终运行您的JAR文件中包含过时的类.所以,jar目标应该取决于compile目标.这样,无论何时运行jar目标,任何更改的类都将首先自动编译.同样,run目标应取决于jar目标.

归档时间：

查看次数：

3386 次

最近记录：

15 年 前
相关归档
Spring CrudRepository findByInventoryIds(List <Long> inventoryIdList) - 相当于IN子句 150
如何将日期字符串解析为Date？ 114
在Java枚举中覆盖valueof()和toString() 113
强制点(".")作为java中的小数分隔符 96
JetBrains使用哪些GUI库？ 90
如何将String转换为BigInteger？ 65
无法从START_OBJECT标记中反序列化java.lang.String的实例 58
JVisualVM和Java Mission Control有什么区别？ 50
SpringBoot - 制作jar文件 - 在META-INF/spring.factories中找不到自动配置类 49
Ant Java任务:如何获得输出到控制台和文件总是记录构建输出而没有shell重定向 6
难疑归档
如何让Git"忘记"一个被跟踪但现在位于.gitignore的文件？ 4888
使用Git将最近的提交移动到新分支 4647
使用jQuery为复选框设置"选中"？ 3988
jQuery是否存在"存在"功能？ 2669
如何在MySQL中使用命令行导入SQL文件？ 1836
静态类变量是否可能？ 1824
使用JavaScript在下拉列表中获取选定的值？ 1660
正确使用IDisposable接口 1586
什么是按位移位(位移)运算符以及它们如何工作？ 1340
从Docker容器内部,如何连接到本机的本地主机？ 1176