Java Gradle找不到依赖项

我正在尝试使用Gradle，文件如下所示：

// 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'
}

如您所见，我添加了两个依赖项，并希望在类中使用它们

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);

    }
}

当我执行语句

gradleassemble

时，出现了编译器错误

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.

我做错了什么

更新 我将代码更改为：

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!");

    }
}

编译器抱怨：

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

---

看起来您仍然需要log4j依赖项本身：

compile:'log4j:log4j:versionX'

更新1：

当然，您应该添加：

private static final Logger logger = Logger.getLogger(DrglMutatieBerichtMdb.class);

更新2：

我使用以下依赖项：

compile 'log4j:log4j:1.2.17'
compile 'org.slf4j:slf4j-api:1.7.5'
compile 'org.slf4j:slf4j-log4j12:1.7.5'

在我导入的代码中：

import org.apache.log4j.Logger;

并按如下方式使用记录器：

private static final Logger logger = Logger.getLogger(DrglMutatieBerichtMdb.class);

private static void testLogger(){
    logger.debug("The logger works!");
}

而不是

import org.apache.log4j.Logger;

使用

并定义LOGGER的实例

private static final Logger LOGGER = LogManager.getLogger("HelloWorld");

看到这个样本了吗

---

这与Gradle无关

我还必须添加依赖项：

compile 'log4j:log4j:1.2.17'
compile 'org.slf4j:slf4j-api:1.7.5'
compile 'org.slf4j:slf4j-log4j12:1.7.5'

---

compile“org.apache.logging.log4j:log4j api:2.3”

顺便提一下，您不想针对SLF4J记录器进行日志记录吗？

logger

未定义，因此永远不会起作用。其次，这是一条局部错误消息。你在运行什么任务，如何运行。我在输入字段中输入Log4j，点击最新版本，这里有一个依赖信息。然后单击Gradle/Grails并将编译“org.apache.logging.log4j:log4j:2.3”复制到我的Gradle文件中。添加依赖项是正确的吗？是的，这可能是正确的。我使用不同的导入：

import org.apache.log4j.Logger编译器仍在抱怨。当您执行
gradle dependencies
private static final Logger LOGGER = LogManager.getLogger("HelloWorld");