libgdx アプリケーションを Eclipse でコンパイルしているときに、次のエラーが発生し続けます。
[ERROR] Errors in 'file:/C:/Users/Zorfie/Programing/Java/workspace/Libgdx/src/sim/states/BasicBox2DState.java'
[ERROR] Line 157: The method nanoTime() is undefined for the type System
[ERROR] Line 159: The method nanoTime() is undefined for the type System
[ERROR] Line 160: The method nanoTime() is undefined for the type System
[ERROR] Line 161: The method nanoTime() is undefined for the type System
[ERROR] Errors in 'jar:file:/C:/Program%20Files/eclipse/plugins/com.google.gwt.eclipse.sdkbundle_2.4.0.v201203300216-rel-r37/gwt-2.4.0/gwt-user.jar!/com/google/web/bindery/autobean/shared/impl/StringQuoter.java'
[ERROR] Line 21: The import org.json cannot be resolved
[ERROR] Line 69: JSONObject cannot be resolved
[ERROR] Errors in 'jar:file:/C:/Program%20Files/eclipse/plugins/com.google.gwt.eclipse.sdkbundle_2.4.0.v201203300216-rel-r37/gwt-2.4.0/gwt-user.jar!/com/google/web/bindery/autobean/vm/impl/JsonSplittable.java'
[ERROR] Line 23: The import org.json cannot be resolved
[ERROR] Line 24: The import org.json cannot be resolved
[ERROR] Line 25: The import org.json cannot be resolved
[ERROR] Line 40: JSONObject cannot be resolved to a type
[ERROR] Line 47: JSONObject cannot be resolved to a type
これは、GWT が .nanoTime() をサポートしていないことを意味します。これは事実ですか、それとも間違った JRE で実行しているだけですか? (プロジェクトを確認したところ、1.6であると言われました)。