Fix file permissions on the executable

com.avojak.plugin.hydrogen.core/src/main/java/com/avojak/plugin/hydrogen/core/contributions/configuration/launch/HydrogenLaunchConfigurationDelegate.java

@@ -3,6 +3,8 @@
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.attribute.AclFileAttributeView;
 import java.util.Arrays;
 import java.util.Optional;
 
@@ -149,6 +151,7 @@ public void launch(final ILaunchConfiguration configuration, final String mode,
 			}
 		}
 
+		setExecutablePermissions(executable);
 		validateExecutable(executable);
 
 		// TODO: Should the executable be copied to a temp location instead of running
@@ -241,6 +244,18 @@ private void validateExecutablePreference(final String executablePreference) thr
 		}
 	}
 
+	/**
+	 * Attempts to set the permissions on the executable such that it can be read
+	 * and executed.
+	 * 
+	 * @param executable
+	 *            The {@link File} to execute.
+	 */
+	private void setExecutablePermissions(final File executable) {
+		executable.setReadable(true);
+		executable.setExecutable(true);
+	}
+
 	/**
 	 * Validate that the given {@link File} exists, is a file, and able to be
 	 * executed.