Resolve #145 support ``hikaricp.configurationFile`` system property to define location to load configuration properties file.

hikaricp-java6/src/main/java/com/zaxxer/hikari/HikariConfig.java

@@ -111,6 +111,11 @@ public class HikariConfig implements HikariConfigMBean
          {
          }
       };
+
+      String systemProp = System.getProperty("hikaricp.configurationFile");
+      if ( systemProp != null) {
+         loadProperties(systemProp);
+      }
    }
 
    /**
@@ -135,26 +140,7 @@ public class HikariConfig implements HikariConfigMBean
    {
       this();
 
-      final File propFile = new File(propertyFileName);
-      try {
-         final InputStream is = propFile.isFile() ? new FileInputStream(propFile) : this.getClass().getResourceAsStream(propertyFileName);
-         if (is != null) {
-            try {
-               Properties props = new Properties();
-               props.load(is);
-               PropertyBeanSetter.setTargetFromProperties(this, props);
-            }
-            finally {
-               is.close();
-            }
-         }
-         else {
-            throw new IllegalArgumentException("Property file " + propertyFileName + " was not found.");
-         }
-      }
-      catch (IOException io) {
-         throw new RuntimeException("Error loading properties file", io);
-      }
+      loadProperties(propertyFileName);
    }
 
    /**
@@ -770,6 +756,30 @@ public class HikariConfig implements HikariConfigMBean
       }
    }
 
+   private void loadProperties(String propertyFileName)
+   {
+      final File propFile = new File(propertyFileName);
+      try {
+         final InputStream is = propFile.isFile() ? new FileInputStream(propFile) : this.getClass().getResourceAsStream(propertyFileName);
+         if (is != null) {
+            try {
+               Properties props = new Properties();
+               props.load(is);
+               PropertyBeanSetter.setTargetFromProperties(this, props);
+            }
+            finally {
+               is.close();
+            }
+         }
+         else {
+            throw new IllegalArgumentException("Property file " + propertyFileName + " was not found.");
+         }
+      }
+      catch (IOException io) {
+         throw new RuntimeException("Error loading properties file", io);
+      }
+   }
+
    void copyState(HikariConfig other)
    {
       for (Field field : HikariConfig.class.getDeclaredFields()) {

hikaricp/src/main/java/com/zaxxer/hikari/HikariConfig.java

@@ -111,6 +111,11 @@ public class HikariConfig implements HikariConfigMBean
          {
          }
       };
+
+      String systemProp = System.getProperty("hikaricp.configurationFile");
+      if ( systemProp != null) {
+         loadProperties(systemProp);
+      }
    }
 
    /**
@@ -135,20 +140,7 @@ public class HikariConfig implements HikariConfigMBean
    {
       this();
 
-      final File propFile = new File(propertyFileName);
-      try (final InputStream is = propFile.isFile() ? new FileInputStream(propFile) : this.getClass().getResourceAsStream(propertyFileName)) {
-         if (is != null) {
-            Properties props = new Properties();
-            props.load(is);
-            PropertyBeanSetter.setTargetFromProperties(this, props);
-         }
-         else {
-            throw new IllegalArgumentException("Property file " + propertyFileName + " was not found.");
-         }
-      }
-      catch (IOException io) {
-         throw new RuntimeException("Error loading properties file", io);
-      }
+      loadProperties(propertyFileName);
    }
 
    /**
@@ -764,6 +756,24 @@ public class HikariConfig implements HikariConfigMBean
       }
    }
 
+   private void loadProperties(String propertyFileName)
+   {
+      final File propFile = new File(propertyFileName);
+      try (final InputStream is = propFile.isFile() ? new FileInputStream(propFile) : this.getClass().getResourceAsStream(propertyFileName)) {
+         if (is != null) {
+            Properties props = new Properties();
+            props.load(is);
+            PropertyBeanSetter.setTargetFromProperties(this, props);
+         }
+         else {
+            throw new IllegalArgumentException("Property file " + propertyFileName + " was not found.");
+         }
+      }
+      catch (IOException io) {
+         throw new RuntimeException("Error loading properties file", io);
+      }
+   }
+
    void copyState(HikariConfig other)
    {
       for (Field field : HikariConfig.class.getDeclaredFields()) {