diff --git a/.travis.yml b/.travis.yml
index 17bb741..34c1631 100755
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: java
 jdk:
-  - openjdk6
+  - openjdk7
 script: "mvn clean install"
 after_success:
   - mvn clean test jacoco:report coveralls:jacoco
@@ -8,4 +8,4 @@ notifications:
   email:
     recipients:
       - toda_k@worksap.co.jp
-      - li_yo@worksap.co.jp
\ No newline at end of file
+      - li_yo@worksap.co.jp
diff --git a/README.md b/README.md
index c7f400c..2dedec5 100755
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ To use this product, please configure your findbugs-maven-plugin like below.
             <plugin>
               <groupId>jp.co.worksap.oss</groupId>
               <artifactId>findbugs-plugin</artifactId>
-              <version>0.0.2</version>
+              <version>0.0.3-SNAPSHOT</version>
             </plugin>
           </plugins>
         </configuration>
@@ -27,6 +27,10 @@ To use this product, please configure your findbugs-maven-plugin like below.
 
 # history
 
+## 0.0.3
+
+- upgraded JDK from 1.6 to 1.7
+
 ## 0.0.2
 
 - added BrokenImmutableClassDetector
diff --git a/pom.xml b/pom.xml
index 6d936a8..4acfaba 100644
--- a/pom.xml
+++ b/pom.xml
@@ -38,8 +38,8 @@
       <plugin>
         <artifactId>maven-compiler-plugin</artifactId>
         <configuration>
-          <source>1.6</source>
-          <target>1.6</target>
+          <source>1.7</source>
+          <target>1.7</target>
           <encoding>${project.build.sourceEncoding}</encoding>
         </configuration>
       </plugin>
diff --git a/src/main/java/jp/co/worksap/oss/findbugs/jsr305/nullness/UnknownNullnessDetector.java b/src/main/java/jp/co/worksap/oss/findbugs/jsr305/nullness/UnknownNullnessDetector.java
index 5318cc2..30702af 100644
--- a/src/main/java/jp/co/worksap/oss/findbugs/jsr305/nullness/UnknownNullnessDetector.java
+++ b/src/main/java/jp/co/worksap/oss/findbugs/jsr305/nullness/UnknownNullnessDetector.java
@@ -66,9 +66,7 @@ private TypeQualifierAnnotation findDefaultAnnotation(XMethod xMethod,
             } else {
                 return null;
             }
-        } catch (SecurityException e) {
-            throw new IllegalStateException(e);
-        } catch (IllegalAccessException e) {
+        } catch (SecurityException | IllegalAccessException e) {
             throw new IllegalStateException(e);
         } catch (InvocationTargetException e) {
             throw new IllegalArgumentException(e);
@@ -93,9 +91,7 @@ private void detectUnknowNullnessOfReturnedValue(Method method,
                     .getDeclaredMethod("getDefaultAnnotation",
                             AnnotatedObject.class, TypeQualifierValue.class, ElementType.class);
             GET_DEFAULT_ANNOTATION.setAccessible(true);
-        } catch (SecurityException e) {
-            throw new IllegalStateException(e);
-        } catch (NoSuchMethodException e) {
+        } catch (SecurityException | NoSuchMethodException e) {
             throw new IllegalStateException(e);
         }
     }