kimmking opened a new issue #4547: YamlConfigurationExampleMain can't running 
with maven-exec in Example.
URL: https://github.com/apache/incubator-shardingsphere/issues/4547
 
 
   When we launch YamlConfigurationExampleMain in command line :
   ```
   cd  
\examples\sharding-jdbc-example\orchestration-example\orchestration-raw-jdbc-example
   
   mvn exec:java 
-Dexec.mainClass="org.apache.shardingsphere.example.orchestration.raw.jdbc.YamlConfigurationExampleMain"
  -Dexec.classpathScope=runtime -Dexec.cleanupDaemonThreads=false
   ```
   
   Error occurs : 
   ```
   [INFO] --- exec-maven-plugin:1.6.0:java (default-cli) @ 
orchestration-raw-jdbc-example ---
   [WARNING]
   java.lang.NullPointerException
       at 
org.apache.shardingsphere.example.orchestration.raw.jdbc.YamlConfigurationExampleMain.getFile
 (YamlConfigurationExampleMain.java:79)
       at 
org.apache.shardingsphere.example.orchestration.raw.jdbc.YamlConfigurationExampleMain.getDataSource
 (YamlConfigurationExampleMain.java:66)
       at 
org.apache.shardingsphere.example.orchestration.raw.jdbc.YamlConfigurationExampleMain.main
 (YamlConfigurationExampleMain.java:53)
       at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
       at sun.reflect.NativeMethodAccessorImpl.invoke 
(NativeMethodAccessorImpl.java:62)
       at sun.reflect.DelegatingMethodAccessorImpl.invoke 
(DelegatingMethodAccessorImpl.java:43)
       at java.lang.reflect.Method.invoke (Method.java:498)
       at org.codehaus.mojo.exec.ExecJavaMojo$1.run (ExecJavaMojo.java:282)
       at java.lang.Thread.run (Thread.java:748)
   ```
   
   Cause Thread.currentThread().getClass() belong to super classloader in 
   ```
   return new 
File(Thread.currentThread().getClass().getResource(fileName).getFile());
   ```
   
   It should be instead of current bootstrap class.
   

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