Gradle没有找到依赖关系 [英] Gradle does not find dependencies
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问题描述
//使用java插件添加对Java的支持
apply plugin：'java'
//在本节中，您声明从哪里可以找到项目的依赖关系
repositories {
//使用'jcenter'解决你的依赖关系。
//你可以在这里声明任何Maven / Ivy /文件库。
mavenCentral（）
jcenter（）
}
jar {
manifest {
属性'Main-Class'：'execute.Entry '
}
}
//在本节中，将声明生产和测试代码的依赖项
dependencies {
//生产代码使用编译时SLF4J日志API
编译'org.slf4j：slf4j-api：1.7.12'
编译'org.apache.logging.log4j：log4j：2.3'
//声明你想用在你的测试中的你最喜欢的测试框架的依赖关系。
// Gradle Test任务也支持TestNG。只需将
// testCompile依赖项更改为testCompile'org.testng：testng：6.8.1'并将
//'test.useTestNG（）'添加到您的构建脚本中。
testCompile'junit：junit：4.12'
}
正如您所见，我添加了两个依赖关系，并希望在类中使用
package execute;
导入消息。*;
import org.apache.log4j.Logger;
public class Entry {
public static void main（String [] args）{
Service s = new Service（）;
String msg = s.GetMessage（）;
LOGGER.info（Received msg：+ msg）;
$ b $ / code $ / pre
当我执行语句<$
D：\ c $ c $> Java\entrypoint\src\main\java\execute\Entry.java：4：错误：程序包org.apache.log4j不存在
import org.apache.log4j.Logger;
^
D：\Java\entrypoint\src\main\java\execute\Entry.java:12：error：can not find symbol
LOGGER.info（ 收到消息：+味精）;
^
符号：变量LOGGER
位置：类入口
2错误
：compileJava失败
失败：构建失败，出现异常。
*出错：
任务'compileJava'的执行失败。
>编译失败;详细信息请参阅编译器错误输出。
*尝试：
使用--stacktrace选项运行以获取堆栈跟踪。使用--info或--debug选项运行以获取更多日志输出。
构建失败
总时间：6.261秒
编译失败;详细信息请参阅编译器错误输出。
我做错了什么？
更新
我将我的代码更改为：
package execute;
导入消息。*;
导入org.apache.logging.log4j.Logger;
导入org.apache.logging.log4j.LogManager;
public class Entry {
private static final Logger logger = LogManager.getLogger（HelloWorld）;
public static void main（String [] args）{
Service s = new Service（）;
String msg = s.GetMessage（）;
logger.info（Hello，World！）;
$ b
编译器抱怨：
线程main中的异常java.lang.NoClassDefFoundError：org / apache / logging / log4j / LogManager
at execute.Entry 。< clinit>（Entry.java:9）
导致：java.lang.ClassNotFoundException：org.apache.logging.log4j.LogManager $ b $ java.net.URLClassLoader.findClass（Unknown Source）
at java.lang.ClassLoader.loadClass（Unknown Source）
at sun.misc.Launcher $ AppClassLoader.loadClass（Unknown Source）
at java.lang.ClassLoader.loadClass（Unknown Source）
... 1 more
更新2
执行后：
> gradle依赖关系
：依赖关系
- -------------------------------------------------- ---------
根项目
------------------------ ------------------------------------
archives - 配置存档工件。
没有依赖项
compile - 为源集main编译类路径。
\ --- org.apache.logging.log4j：log4j-api：2.3
default - 默认工件的配置。
\ --- org.apache.logging.log4j：log4j-api：2.3
runtime - 源代码集main的运行时类路径。
\ --- org.apache.logging.log4j：log4j-api：2.3
testCompile - 为源集test编译classpath。
+ --- org.apache.logging.log4j：log4j-api：2.3
\ --- junit：junit：4.12
\ --- org.hamcrest：hamcrest-核心：1.3
testRuntime - 源代码集test的运行时类路径。
+ --- org.apache.logging.log4j：log4j-api：2.3
\ --- junit：junit：4.12
\ --- org.hamcrest：hamcrest-核心：1.3
建立成功
解决方案而不是
import org.apache.log4j.Logger;
使用
import org.apache.logging.log4j.Logger;
并定义LOGGER的实例
private static final Logger LOGGER = LogManager.getLogger（HelloWorld）;
查看样本
http://logging.apache.org/log4j/2.x/manual/api.html
这与Gradle
没有任何关系I am trying to use Gradle and the file looks like:
// Apply the java plugin to add support for Java
apply plugin: 'java'
// In this section you declare where to find the dependencies of your project
repositories {
// Use 'jcenter' for resolving your dependencies.
// You can declare any Maven/Ivy/file repository here.
mavenCentral()
jcenter()
}
jar {
manifest {
attributes 'Main-Class': 'execute.Entry'
}
}
// In this section you declare the dependencies for your production and test code
dependencies {
// The production code uses the SLF4J logging API at compile time
compile 'org.slf4j:slf4j-api:1.7.12'
compile 'org.apache.logging.log4j:log4j:2.3'
// Declare the dependency for your favourite test framework you want to use in your tests.
// TestNG is also supported by the Gradle Test task. Just change the
// testCompile dependency to testCompile 'org.testng:testng:6.8.1' and add
// 'test.useTestNG()' to your build script.
testCompile 'junit:junit:4.12'
}
As you can see, I've added two dependencies and want to use in a class
package execute;
import message.*;
import org.apache.log4j.Logger;
public class Entry {
public static void main(String[] args) {
Service s = new Service();
String msg = s.GetMessage();
LOGGER.info("Received msg: " + msg);
}
}
When I execute the statement gradle assemble, I've got the compiler error.
D:\Java\entrypoint\src\main\java\execute\Entry.java:4: error: package org.apache.log4j does not exist
import org.apache.log4j.Logger;
^
D:\Java\entrypoint\src\main\java\execute\Entry.java:12: error: cannot find symbol
LOGGER.info("Received msg: " + msg);
^
symbol: variable LOGGER
location: class Entry
2 errors
:compileJava FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':compileJava'.
> Compilation failed; see the compiler error output for details.
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
BUILD FAILED
Total time: 6.261 secs
Compilation failed; see the compiler error output for details.
What am I doing wrong?
Update
I changed my code to this:
package execute;
import message.*;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.LogManager;
public class Entry {
private static final Logger logger = LogManager.getLogger("HelloWorld");
public static void main(String[] args) {
Service s = new Service();
String msg = s.GetMessage();
logger.info("Hello, World!");
}
}
The compiler complain:
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/logging/log4j/LogManager
at execute.Entry.<clinit>(Entry.java:9)
Caused by: java.lang.ClassNotFoundException: org.apache.logging.log4j.LogManager
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 1 more
Update 2
After execute:
>gradle dependencies
:dependencies
------------------------------------------------------------
Root project
------------------------------------------------------------
archives - Configuration for archive artifacts.
No dependencies
compile - Compile classpath for source set 'main'.
\--- org.apache.logging.log4j:log4j-api:2.3
default - Configuration for default artifacts.
\--- org.apache.logging.log4j:log4j-api:2.3
runtime - Runtime classpath for source set 'main'.
\--- org.apache.logging.log4j:log4j-api:2.3
testCompile - Compile classpath for source set 'test'.
+--- org.apache.logging.log4j:log4j-api:2.3
\--- junit:junit:4.12
\--- org.hamcrest:hamcrest-core:1.3
testRuntime - Runtime classpath for source set 'test'.
+--- org.apache.logging.log4j:log4j-api:2.3
\--- junit:junit:4.12
\--- org.hamcrest:hamcrest-core:1.3
BUILD SUCCESSFUL
解决方案 Instead of
import org.apache.log4j.Logger;
use
import org.apache.logging.log4j.Logger;
and define the instance of LOGGER
private static final Logger LOGGER = LogManager.getLogger("HelloWorld");
See this sample
http://logging.apache.org/log4j/2.x/manual/api.html
this has nothing todo with Gradle
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