Fix bug with import java.lang.subpackage

src/main/java/spoon/reflect/visitor/printer/ElementPrinterHelper.java

@@ -250,6 +250,10 @@ public void writeActualTypeArguments(CtActualTypeContainer ctGenericElementRefer
 		}
 	}
 
+	private boolean isJavaLangClasses(String importType) {
+		return importType.matches("^(java\\.lang\\.)[^.]*$");
+	}
+
 	/**
 	 * Write the compilation unit header.
 	 */
@@ -283,7 +287,7 @@ public void writeHeader(List<CtType<?>> types, Collection<CtReference> imports)
 					importTypeStr = this.removeInnerTypeSeparator(fieldRef.getDeclaringType().getQualifiedName()) + "." + fieldRef.getSimpleName();
 				}
 
-				if (!importTypeStr.equals("") && !importTypeStr.startsWith("java.lang")) {
+				if (!importTypeStr.equals("") && !isJavaLangClasses(importTypeStr)) {
 					printer.write(importStr + " " + importTypeStr + ";").writeln().writeTabs();
 				}
 			}

src/test/java/spoon/test/imports/ImportTest.java

@@ -929,4 +929,16 @@ public void testJavaLangIsConsideredAsImported() {
 
 		canBeBuilt(outputDir, 7);
 	}
+
+	@Test
+	public void testJavaLangIsConsideredAsImportedButNotForSubPackages() {
+		final Launcher launcher = new Launcher();
+		launcher.getEnvironment().setAutoImports(true);
+		String outputDir = "./target/spooned-javalang";
+		launcher.addInputResource("./src/test/java/spoon/test/imports/testclasses/Reflection.java");
+		launcher.setSourceOutputDirectory(outputDir);
+		launcher.run();
+
+		canBeBuilt(outputDir, 7);
+	}
 }

src/test/java/spoon/test/imports/testclasses/Reflection.java

@@ -0,0 +1,10 @@
+package spoon.test.imports.testclasses;
+
+import java.lang.reflect.Field;
+
+/**
+ * Created by urli on 29/05/2017.
+ */
+public class Reflection {
+    Field field;
+}