Java GetResourceAsStream NullPointerException

我有一个jar，我通常在.sh脚本中使用jsvc启动器作为守护进程运行。 现在，我创建了一个新的入口点，它需要检查一些内容并在控制台上返回一个输出，因此在同一个.sh脚本中，我根据参数进行了切换，以作为守护进程或标准java应用程序运行。 sh与此类似：

#!/bin/sh

# Setup variables
EXEC=/usr/bin/jsvc
JAVA_HOME=/usr/lib/jvm/java-7-oracle
CLASS_PATH="./conf:/usr/share/java/commons-daemon.jar:./:./dist/core.jar"

do_exec()
{
    $EXEC -home "$JAVA_HOME" -cp $CLASS_PATH $1 $CLASS
}

for i in `ls ./dist/lib/*.jar`
do
  CLASS_PATH=${CLASS_PATH}:${i}
done

case "$1" in
    start)
            do_exec
            ;;
    stop)
            do_exec "-stop"
            ;;
    check)
            java -jar ./dist/core.jar check
            ;;
    *)
            echo "usage: daemon {start|stop|restart|check}" >&2
            exit 3
            ;;
esac

我的core.jar只有在以“check”标志启动时才能读取我的core.properties文件，代码为：

public class Config {

    private final static String RESOURCE_NAME = "core.properties";
    private static Properties properties = null;

    public static synchronized void init() {
        if (properties != null) {
            return;
        }
        try {
            properties = new Properties();
            properties.load(Config.class.getClassLoader().getResourceAsStream(RESOURCE_NAME));  <--- problematic line
        } catch (Exception e) {
            e.printStackTrace();
        } 
    }

    public static String get() {
       ...
    }
}

我的文件夹结构如下：

root folder
    |_ run.sh
    |_ conf
         |_ core.properties
    |_ dist
         |_ core.jar
         |_ lib
             |_ lib1.jar
             |_ lib2.jar
             |_ lib3.jar
             |_ ....jar
             |_ ....jar

我的jar清单如下所示：

Manifest-Version: 1.0
Archiver-Version: Plexus Archiver
Created-By: Apache Maven
Built-By: Administrator
Build-Jdk: 1.7.0_21
Main-Class: me.zenfeed.Main
Class-Path: ./conf/ ./dist/lib/junit-4.11.jar ./dist/lib/hamcrest-core-1.3.jar ....etc...

我看到包含了conf目录，但我不知道./conf/是否包含该目录中的所有文件。 我应该怎么做才能使属性文件作为守护进程和标准jar一样可读

---

谢谢

我找到了解决办法。pom.xml中有一个问题，它给了类路径一个错误的前缀

这是：

<plugin>
    <artifactId>maven-jar-plugin</artifactId>
    <version>2.2</version>
    <configuration>
        <archive>
            <!-- Make an executable jar, adjust classpath entries-->
            <manifest>
                <addClasspath>true</addClasspath>
                <classpathPrefix>.dist/lib/</classpathPrefix>
                <mainClass>xxxxxxx</mainClass>
            </manifest>
            <!--Resources will be placed under conf/-->
            <manifestEntries>
                <Class-Path>./conf/</Class-Path>
            </manifestEntries>
        </archive>
        <finalName>${project.artifactId}</finalName>
        <outputDirectory>${project.build.directory}/dist</outputDirectory>
    </configuration>
</plugin>

maven jar插件
2.2
真的
.dist/lib/
xxxxxxx
/配置/
${project.artifactId}
${project.build.directory}/dist

与此相反：

<plugin>
    <artifactId>maven-jar-plugin</artifactId>
    <version>2.2</version>
    <configuration>
        <archive>
            <!-- Make an executable jar, adjust classpath entries-->
            <manifest>
                <addClasspath>true</addClasspath>
                <classpathPrefix>./lib/</classpathPrefix>
                <mainClass>xxxxxxx</mainClass>
            </manifest>
            <!--Resources will be placed under conf/-->
            <manifestEntries>
                <Class-Path>../conf/</Class-Path>
            </manifestEntries>
        </archive>
        <finalName>${project.artifactId}</finalName>
        <outputDirectory>${project.build.directory}/dist</outputDirectory>
    </configuration>
</plugin>

maven jar插件
2.2
真的
/lib/
xxxxxxx
../conf/
${project.artifactId}
${project.build.directory}/dist

<plugin>
    <artifactId>maven-jar-plugin</artifactId>
    <version>2.2</version>
    <configuration>
        <archive>
            <!-- Make an executable jar, adjust classpath entries-->
            <manifest>
                <addClasspath>true</addClasspath>
                <classpathPrefix>./lib/</classpathPrefix>
                <mainClass>xxxxxxx</mainClass>
            </manifest>
            <!--Resources will be placed under conf/-->
            <manifestEntries>
                <Class-Path>../conf/</Class-Path>
            </manifestEntries>
        </archive>
        <finalName>${project.artifactId}</finalName>
        <outputDirectory>${project.build.directory}/dist</outputDirectory>
    </configuration>
</plugin>