Integrated less 1.7.0 and fixed sandroboehme/lesscss-maven-plugin#1. The next less.js release should have that fixed already. See less/less.js#1956.

Author: Sandro Boehme

pom.xml

@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>org.lesscss</groupId>
     <artifactId>lesscss</artifactId>
-    <version>1.6.1-SNAPSHOT</version>
+    <version>1.7.0.1.0-SNAPSHOT</version>
     <packaging>jar</packaging>
     <name>Official LESS CSS Compiler for Java</name>
     <description>Official LESS CSS Compiler for Java</description>

src/main/java/org/lesscss/LessCompiler.java

@@ -65,8 +65,8 @@ public class LessCompiler {
 
     private static final LessLogger logger = LessLoggerFactory.getLogger(LessCompiler.class);
 
-    private URL lessJs = LessCompiler.class.getClassLoader().getResource("META-INF/less-rhino-1.6.1.js");
-    private URL lesscJs = LessCompiler.class.getClassLoader().getResource("META-INF/lessc-rhino-1.6.1.js");
+    private URL lessJs = LessCompiler.class.getClassLoader().getResource("META-INF/less-rhino-1.7.0.js");
+    private URL lesscJs = LessCompiler.class.getClassLoader().getResource("META-INF/lessc-rhino-1.7.0.js");
     private List<URL> customJs = Collections.emptyList();
     private List<String> options = Collections.emptyList();
     private Boolean compress = null;

…n/resources/META-INF/less-rhino-1.6.1.js …n/resources/META-INF/less-rhino-1.7.0.jssrc/main/resources/META-INF/less-rhino-1.6.1.js renamed to src/main/resources/META-INF/less-rhino-1.7.0.js src/main/resources/META-INF/less-rhino-1.6.1.js renamed to src/main/resources/META-INF/less-rhino-1.7.0.js

@@ -1,4 +1,4 @@
-/* LESS.js v1.6.1 RHINO | Copyright (c) 2009-2014, Alexis Sellier <[email protected]> */
+/* LESS.js v1.7.0 RHINO | Copyright (c) 2009-2014, Alexis Sellier <[email protected]> */
 
 /*global name:true, less, loadStyleSheet, os */
 
@@ -57,7 +57,8 @@ function formatError(ctx, options) {
 function writeError(ctx, options) {
     options = options || {};
     if (options.silent) { return; }
-    print(formatError(ctx, options));
+    var message = formatError(ctx, options);
+    throw new Error(message);
 }
 
 function loadStyleSheet(sheet, callback, reload, remaining) {

…/resources/META-INF/lessc-rhino-1.6.1.js …/resources/META-INF/lessc-rhino-1.7.0.jssrc/main/resources/META-INF/lessc-rhino-1.6.1.js renamed to src/main/resources/META-INF/lessc-rhino-1.7.0.js src/main/resources/META-INF/lessc-rhino-1.6.1.js renamed to src/main/resources/META-INF/lessc-rhino-1.7.0.js

@@ -17,12 +17,17 @@
 import static org.junit.Assert.assertTrue;
 
 import org.junit.Test;
+import org.lesscss.LessException;
 
 public class LessExceptionIT extends AbstractCompileIT {
 
     @Test
     public void testException() throws Exception {
-        String output = lessCompiler.compile("a { color: @linkColor; }");
-        assertTrue(output.startsWith("NameError: variable @linkColor is undefined in"));
+		try {
+			lessCompiler.compile("a { color: @linkColor; }");
+		} catch (LessException e) {
+			String exceptionMsg = e.getMessage();
+			assertTrue(exceptionMsg!=null && exceptionMsg.startsWith("NameError: variable @linkColor is undefined in"));
+		}
     }
 }

src/test/java/integration/LessExceptionIT.java

@@ -80,7 +80,7 @@ public class LessCompilerTest {
 
     @Mock private URL lessJsFile;
     @Mock private URLConnection lessJsURLConnection;
-    private static final String lessJsURLToString = "less-rhino-1.6.1.js";
+    private static final String lessJsURLToString = "less-rhino-1.7.0.js";
     @Mock private InputStream lessJsInputStream;
     @Mock private InputStreamReader lessJsInputStreamReader;
 
@@ -106,8 +106,8 @@ public void setUp() throws Exception {
 
     @Test
     public void testNewLessCompiler() throws Exception {
-        assertEquals(LessCompiler.class.getClassLoader().getResource("META-INF/less-rhino-1.6.1.js"), FieldUtils.readField(lessCompiler, "lessJs", true));
-        assertEquals(LessCompiler.class.getClassLoader().getResource("META-INF/lessc-rhino-1.6.1.js"), FieldUtils.readField(lessCompiler, "lesscJs", true));
+        assertEquals(LessCompiler.class.getClassLoader().getResource("META-INF/less-rhino-1.7.0.js"), FieldUtils.readField(lessCompiler, "lessJs", true));
+        assertEquals(LessCompiler.class.getClassLoader().getResource("META-INF/lessc-rhino-1.7.0.js"), FieldUtils.readField(lessCompiler, "lesscJs", true));
         assertEquals(Collections.EMPTY_LIST, FieldUtils.readField(lessCompiler, "customJs", true));
     }
 

src/test/java/org/lesscss/LessCompilerTest.java

@@ -17,7 +17,7 @@
   format: "rgb(32, 128, 64)";
   format-string: "hello world";
   format-multiple: "hello earth 2";
-  format-url-encode: "red is %23ff0000";
+  format-url-encode: 'red is %23ff0000';
   eformat: rgb(32, 128, 64);
   hue: 98;
   saturation: 12%;