Question

我正在尝试将maven作为构建系统迁移，以便对依赖项进行更标准的管理。

这是我要做的步骤和我问的简单（maven新手）问题。这个过程是最直接的，我可以想象，所以这个问题应该很容易重现。

让我们从File，New Project，Maven，Web Application开始。在下面的表单中，我保留所有默认值，但是对于我选择“Apache Tomcat 7.0.11.0”的应用程序服务器字段。我注意到这个向导没有提出任何框架（Sring，Hibernate等），而标准的非maven项目创建向导确实允许包含框架的选择。

如果我们现在看看这个项目，我们看到的是：

enter image description here

所以第一个问题是：为什么春天已经被包括在内，甚至在我明确添加之前呢？

让我们来看看项目属性：
enter image description here

所以没有选择框架。我想将spring用于它的依赖注入容器（以后我可能会添加spring安全性，但这不是当下的优先事项）。 我是否需要再次添加，因为如上所述，已经包含了一些核心模块？

在项目属性中，在框架节点中，我添加了Hibernate并选择了数据库连接。依赖关系现在变为如下。

enter image description here

其中两个（我在屏幕截图中突出显示它们）被标记为“依赖尚未下载。构建项目以纠正错误”（当您将指针移到它们上面时，您可以看到此消息作为提示）。我已经建立了这个项目，但错误仍然存在在maven的输出中，我看到：

Failed to execute goal on project CreatingMavenSpringProject: Could not resolve dependencies for project com.mycompany:CreatingMavenSpringProject:war:1.0-SNAPSHOT: The following artifacts could not be resolved: javax.sql:jdbc-stdext:jar:2.0, javax.transaction:jta:jar:1.0.1B: Could not find artifact javax.sql:jdbc-stdext:jar:2.0 in unknown-jars-temp-repo (file:C:\Users\agostino\Documents\NetBeansProjects\CreatingMavenSpringProject/lib) -> [Help 1]

To see the full stack trace of the errors, re-run Maven with the -e switch.
Re-run Maven using the -X switch to enable full debug logging.

我按照它的建议尝试了：

org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal o
n project CreatingMavenSpringProject: Could not resolve dependencies for project
 com.mycompany:CreatingMavenSpringProject:war:1.0-SNAPSHOT: The following artifa
cts could not be resolved: javax.sql:jdbc-stdext:jar:2.0, javax.transaction:jta:
jar:1.0.1B: Failure to find javax.sql:jdbc-stdext:jar:2.0 in file:C:\Users\agost
ino\Documents\NetBeansProjects\CreatingMavenSpringProject/lib was cached in the
local repository, resolution will not be reattempted until the update interval o
f unknown-jars-temp-repo has elapsed or updates are forced
        at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDe
pendencies(LifecycleDependencyResolver.java:210)
        at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.resol
veProjectDependencies(LifecycleDependencyResolver.java:117)
        at org.apache.maven.lifecycle.internal.MojoExecutor.ensureDependenciesAr
eResolved(MojoExecutor.java:258)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor
.java:201)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor
.java:153)
        at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor
.java:145)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProje
ct(LifecycleModuleBuilder.java:84)
        at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProje
ct(LifecycleModuleBuilder.java:59)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBu
ild(LifecycleStarter.java:183)
        at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(Lifecycl
eStarter.java:161)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
        at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
        at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Laun
cher.java:290)
        at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.jav
a:230)
        at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(La
uncher.java:409)
        at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:
352)
Caused by: org.apache.maven.project.DependencyResolutionException: Could not res
olve dependencies for project com.mycompany:CreatingMavenSpringProject:war:1.0-S
NAPSHOT: The following artifacts could not be resolved: javax.sql:jdbc-stdext:ja
r:2.0, javax.transaction:jta:jar:1.0.1B: Failure to find javax.sql:jdbc-stdext:j
ar:2.0 in file:C:\Users\agostino\Documents\NetBeansProjects\CreatingMavenSpringP
roject/lib was cached in the local repository, resolution will not be reattempte
d until the update interval of unknown-jars-temp-repo has elapsed or updates are
 forced
        at org.apache.maven.project.DefaultProjectDependenciesResolver.resolve(D
efaultProjectDependenciesResolver.java:189)
        at org.apache.maven.lifecycle.internal.LifecycleDependencyResolver.getDe
pendencies(LifecycleDependencyResolver.java:185)
        ... 22 more
Caused by: org.sonatype.aether.resolution.DependencyResolutionException: The fol
lowing artifacts could not be resolved: javax.sql:jdbc-stdext:jar:2.0, javax.tra
nsaction:jta:jar:1.0.1B: Failure to find javax.sql:jdbc-stdext:jar:2.0 in file:C
:\Users\agostino\Documents\NetBeansProjects\CreatingMavenSpringProject/lib was c
ached in the local repository, resolution will not be reattempted until the upda
te interval of unknown-jars-temp-repo has elapsed or updates are forced
        at org.sonatype.aether.impl.internal.DefaultRepositorySystem.resolveDepe
ndencies(DefaultRepositorySystem.java:375)
        at org.apache.maven.project.DefaultProjectDependenciesResolver.resolve(D
efaultProjectDependenciesResolver.java:183)
        ... 23 more
Caused by: org.sonatype.aether.resolution.ArtifactResolutionException: The follo
wing artifacts could not be resolved: javax.sql:jdbc-stdext:jar:2.0, javax.trans
action:jta:jar:1.0.1B: Failure to find javax.sql:jdbc-stdext:jar:2.0 in file:C:\
Users\agostino\Documents\NetBeansProjects\CreatingMavenSpringProject/lib was cac
hed in the local repository, resolution will not be reattempted until the update
 interval of unknown-jars-temp-repo has elapsed or updates are forced
        at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolve(Def
aultArtifactResolver.java:538)
        at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolveArti
facts(DefaultArtifactResolver.java:216)
        at org.sonatype.aether.impl.internal.DefaultRepositorySystem.resolveDepe
ndencies(DefaultRepositorySystem.java:358)
        ... 24 more
Caused by: org.sonatype.aether.transfer.ArtifactNotFoundException: Failure to fi
nd javax.sql:jdbc-stdext:jar:2.0 in file:C:\Users\agostino\Documents\NetBeansPro
jects\CreatingMavenSpringProject/lib was cached in the local repository, resolut
ion will not be reattempted until the update interval of unknown-jars-temp-repo
has elapsed or updates are forced
        at org.sonatype.aether.impl.internal.DefaultUpdateCheckManager.newExcept
ion(DefaultUpdateCheckManager.java:230)
        at org.sonatype.aether.impl.internal.DefaultUpdateCheckManager.checkArti
fact(DefaultUpdateCheckManager.java:204)
        at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolve(Def
aultArtifactResolver.java:427)
        ... 26 more

现在我陷入困境，请注意，当您尝试添加hibernate时，这是maven项目的开箱即用行为。如何解决这个问题？

Answer 1

使用Tomcat 7.0.27我没有看到第一个问题（Spring依赖项），但我可以复制第二个问题（无法下载depdencies）。检查pom.xml我发现它有错误，例如这种依赖：

<dependency>
    <groupId>unknown.binary</groupId>
    <artifactId>derbyclient</artifactId>
    <version>SNAPSHOT</version>
</dependency>

和此存储库：

<repository>
    <id>unknown-jars-temp-repo</id>
    <name>A temporary repository created by NetBeans for libraries and jars it 
    could not identify. Please replace the dependencies in this repository with 
    correct ones and delete this repository.</name>
    <url>file:${project.basedir}/lib</url>
</repository>

尽管Netbeans wiki页面显示了使用Maven项目选择框架的示例，但我建议您从“Dependencies”节点的“Add dependency ...”选项中添加依赖项。

修改：在其他计算机上重复相同步骤后添加了pom.xml错误。

Answer 2

您可以通过在存储库部分下添加以下存储库来手动修改POM文件：

<repositories>
   ...
   <repository>
      <id>java.net-m2</id>
      <name>java.net - Maven 2</name>
      <url>https://repository.jboss.org/nexus/content/repositories/java.net-m2</url>
   </repository>
</repositories>

Answer 3

您始终可以手动下载依赖项。例如，您可以下载 - 来自http://download.java.net/maven/2/javax/sql/jdbc-stdext/2.0/jdbc-stdext-2.0.jar的jdbc-stdext-2.0.jar - 来自http://download.java.net/maven/2/javax/transaction/jta/1.0.1B/jta-1.0.1B.jar

的jta-1.0.1B.jar

然后将jar放在.m2存储库中的正确位置。 - .m2 / repository / javax / sql / jdbc-stdext / 2.0 / jdbc-stdext-2.0.jar - .m2 / repository / javax / transaction / jta / 1.0.1B / jta-1.0.1B.jar

然后运行maven clean并构建。

NetBeans 7.2，启动maven spring项目并添加hibernate

3 个答案: