Fixed smoke tests for JDT UI views failing to understand JDK version

Original code was doing too much, we don't need that here since we run
the test in same JVM.

System property "java.specification.version" has all we need

Fixes #387

org.eclipse.jdt.ui.tests/ui/org/eclipse/jdt/ui/tests/views/SmokeViewsTest.java

@@ -17,9 +17,6 @@
 import static org.junit.Assert.fail;
 
 import java.io.File;
-import java.io.FileReader;
-import java.io.IOException;
-import java.util.Properties;
 
 import org.junit.After;
 import org.junit.Before;
@@ -100,6 +97,11 @@ public void testOpenBytecodeOutlineView() throws Exception {
 		smokeTest("org.eclipse.jdt.bcoview.views.BytecodeOutlineView");
 	}
 
+	@Test
+	public void testOpenBytecodeReferenceView() throws Exception {
+		smokeTest("org.eclipse.jdt.bcoview.views.BytecodeReferenceView");
+	}
+
 	private void smokeTest(String viewId) throws PartInitException {
 		view = window.getActivePage().showView(viewId);
 		assertNotNull("View " + viewId + " should be created", view);
@@ -143,12 +145,12 @@ private IEditorPart openClassEditor() throws JavaModelException, PartInitExcepti
 		return ceditor;
 	}
 
-	private IJavaProject createProject() throws CoreException, IOException {
+	private IJavaProject createProject() throws CoreException {
 		IJavaProject project = JavaProjectHelper.createJavaProject("SmokeViewsTest", "bin");
 
 		String javaHome = System.getProperty("java.home") + File.separator;
 		String latestSupportedJavaVersion = JavaCore.latestSupportedJavaVersion();
-		String jdkRelease = readJdkRelease(javaHome);
+		String jdkRelease = System.getProperty("java.specification.version");
 		if(jdkRelease.compareTo(latestSupportedJavaVersion) >= 0) {
 			JavaProjectHelper.setLatestCompilerOptions(project);
 		} else {
@@ -170,21 +172,4 @@ private IJavaProject createProject() throws CoreException, IOException {
 		return project;
 	}
 
-	/*
-	 * See org.eclipse.jdt.internal.compiler.util.Jdk.readJdkReleaseFile(String)
-	 */
-	static String readJdkRelease(String javaHome) throws IOException {
-		Properties properties = new Properties();
-		try(FileReader reader = new FileReader(new File(javaHome, "release"))){ //$NON-NLS-1$
-			properties.load(reader);
-		}
-		// Something like JAVA_VERSION="1.8.0_05"
-		String ver = properties.getProperty("JAVA_VERSION"); //$NON-NLS-1$
-		if (ver != null) {
-			ver = ver.replace("\"", "");  //$NON-NLS-1$//$NON-NLS-2$
-			// We only want major part
-			ver = ver.substring(0, ver.indexOf('.'));
-		}
-		return ver;
-	}
 }