Question

我试图让Maven清理/安装，但这是我安装时会发生的事情：

select avg(convert(float,score))
from GradingScores 
where isnumeric(score)=1

我不知道这是怎么回事。我发现删除.m2文件夹可以解决问题，但它没有。

这是我的pom：

...
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding Cp1252, i.e. build is platform dependent!
[INFO] Compiling 53 source files to C:\demoBancoWeb\target\classes
[INFO] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/dao/ConsignacionesDAO.java: Some input files use unchecked or unsafe operations.
[INFO] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/dao/ConsignacionesDAO.java: Recompile with -Xlint:unchecked for details.
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[4,21] package javax.servlet does not exist
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[5,21] package javax.servlet does not exist
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[6,32] package javax.servlet.annotation does not exist
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[7,26] package javax.servlet.http does not exist
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[8,26] package javax.servlet.http does not exist
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[9,26] package javax.servlet.http does not exist
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[19,37] cannot find symbol
  symbol: class HttpServlet
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[18,2] cannot find symbol
  symbol: class WebServlet
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[35,26] cannot find symbol
  symbol:   class ServletConfig
  location: class co.edu.icesi.demo.servlet.ControlCliente
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[35,55] cannot find symbol
  symbol:   class ServletException
  location: class co.edu.icesi.demo.servlet.ControlCliente
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[49,30] cannot find symbol
  symbol:   class HttpServletRequest
  location: class co.edu.icesi.demo.servlet.ControlCliente
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[49,58] cannot find symbol
  symbol:   class HttpServletResponse
  location: class co.edu.icesi.demo.servlet.ControlCliente
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[49,95] cannot find symbol
  symbol:   class ServletException
  location: class co.edu.icesi.demo.servlet.ControlCliente
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[61,31] cannot find symbol
  symbol:   class HttpServletRequest
  location: class co.edu.icesi.demo.servlet.ControlCliente
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[61,59] cannot find symbol
  symbol:   class HttpServletResponse
  location: class co.edu.icesi.demo.servlet.ControlCliente
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[61,96] cannot find symbol
  symbol:   class ServletException
  location: class co.edu.icesi.demo.servlet.ControlCliente
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/vista/LoginView.java:[8,26] package javax.servlet.http does not exist
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/controller/OperacionesMatematicas.java:[3,30] package javax.websocket.server does not exist
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/vista/LoginView.java:[39,27] cannot find symbol
  symbol:   class HttpSession
  location: class co.edu.icesi.demo.vista.LoginView
[INFO] 19 errors 
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 02:10 min
[INFO] Finished at: 2016-05-20T21:41:51-05:00
[INFO] Final Memory: 20M/143M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.3:compile (default-compile) on project demoBancoWeb: Compilation failure: Compilation failure:
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[4,21] package javax.servlet does not exist
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[5,21] package javax.servlet does not exist
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[6,32] package javax.servlet.annotation does not exist
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[7,26] package javax.servlet.http does not exist
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[8,26] package javax.servlet.http does not exist
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[9,26] package javax.servlet.http does not exist
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[19,37] cannot find symbol
[ERROR] symbol: class HttpServlet
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[18,2] cannot find symbol
[ERROR] symbol: class WebServlet
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[35,26] cannot find symbol
[ERROR] symbol:   class ServletConfig
[ERROR] location: class co.edu.icesi.demo.servlet.ControlCliente
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[35,55] cannot find symbol
[ERROR] symbol:   class ServletException
[ERROR] location: class co.edu.icesi.demo.servlet.ControlCliente
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[49,30] cannot find symbol
[ERROR] symbol:   class HttpServletRequest
[ERROR] location: class co.edu.icesi.demo.servlet.ControlCliente
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[49,58] cannot find symbol
[ERROR] symbol:   class HttpServletResponse
[ERROR] location: class co.edu.icesi.demo.servlet.ControlCliente
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[49,95] cannot find symbol
[ERROR] symbol:   class ServletException
[ERROR] location: class co.edu.icesi.demo.servlet.ControlCliente
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[61,31] cannot find symbol
[ERROR] symbol:   class HttpServletRequest
[ERROR] location: class co.edu.icesi.demo.servlet.ControlCliente
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[61,59] cannot find symbol
[ERROR] symbol:   class HttpServletResponse
[ERROR] location: class co.edu.icesi.demo.servlet.ControlCliente
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/servlet/ControlCliente.java:[61,96] cannot find symbol
[ERROR] symbol:   class ServletException
[ERROR] location: class co.edu.icesi.demo.servlet.ControlCliente
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/vista/LoginView.java:[8,26] package javax.servlet.http does not exist
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/controller/OperacionesMatematicas.java:[3,30] package javax.websocket.server does not exist
[ERROR] /C:/demoBancoWeb/src/main/java/co/edu/icesi/demo/vista/LoginView.java:[39,27] cannot find symbol
[ERROR] symbol:   class HttpSession
[ERROR] location: class co.edu.icesi.demo.vista.LoginView
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

提前致谢

Answer 1

由于缺少servlet-api。在你的pom中加入以下依赖

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version> //Change the version as per your needs
            <scope>provided</scope> //use provided if you are deploying war in a container
        </dependency>

Answer 2

Maven无法在其存储库中找到servlet-api.jar，因此在编译时无法找到依赖项。我们应该在Pom.xml中添加依赖项，以便maven可以下载所需的servlet-api.jar及其相关的jar。

Maven安装 - 编译错误

2 个答案: