Fix JPMS module setup (fixes #1315) (#1402)

* Fix JPMS module setup (fixes #1315)

* Re-added cause to AssertionErrors

.travis.yml

@@ -1,8 +1,7 @@
 language: java
 
 jdk:
-  - openjdk7
+  - oraclejdk9
-  - oraclejdk8
 
 install: mvn -f gson install -DskipTests=true
 script: mvn -f gson test

gson/build.gradle

@@ -2,7 +2,7 @@ apply plugin: 'java'
 apply plugin: 'maven'
 
 group = 'com.google.code.gson'
-version = '2.8.4-SNAPSHOT'
+version = '2.8.6-SNAPSHOT'
 
 sourceCompatibility = 1.6
 targetCompatibility = 1.6

gson/pom.xml

@@ -34,7 +34,7 @@
       <plugin>
         <groupId>biz.aQute.bnd</groupId>
         <artifactId>bnd-maven-plugin</artifactId>
-        <version>3.1.0</version>
+        <version>4.0.0</version>
         <executions>
           <execution>
             <goals>

gson/src/main/java/com/google/gson/Gson.java

@@ -705,7 +705,9 @@ public final class Gson {
     } catch (IOException e) {
       throw new JsonIOException(e);
     } catch (AssertionError e) {
-      throw new AssertionError("AssertionError (GSON " + GsonBuildConfig.VERSION + "): " + e.getMessage(), e);
+      AssertionError error = new AssertionError("AssertionError (GSON " + GsonBuildConfig.VERSION + "): " + e.getMessage());
+      error.initCause(e);
+      throw error;
     } finally {
       writer.setLenient(oldLenient);
       writer.setHtmlSafe(oldHtmlSafe);
@@ -783,7 +785,9 @@ public final class Gson {
     } catch (IOException e) {
       throw new JsonIOException(e);
     } catch (AssertionError e) {
-      throw new AssertionError("AssertionError (GSON " + GsonBuildConfig.VERSION + "): " + e.getMessage(), e);
+      AssertionError error = new AssertionError("AssertionError (GSON " + GsonBuildConfig.VERSION + "): " + e.getMessage());
+      error.initCause(e);
+      throw error;
     } finally {
       writer.setLenient(oldLenient);
       writer.setHtmlSafe(oldHtmlSafe);
@@ -941,7 +945,9 @@ public final class Gson {
       // TODO(inder): Figure out whether it is indeed right to rethrow this as JsonSyntaxException
       throw new JsonSyntaxException(e);
     } catch (AssertionError e) {
-      throw new AssertionError("AssertionError (GSON " + GsonBuildConfig.VERSION + "): " + e.getMessage(), e);
+      AssertionError error = new AssertionError("AssertionError (GSON " + GsonBuildConfig.VERSION + "): " + e.getMessage());
+      error.initCause(e);
+      throw error;
     } finally {
       reader.setLenient(oldLenient);
     }

pom.xml

@@ -63,13 +63,28 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-compiler-plugin</artifactId>
-          <version>3.7.0</version>
+          <version>3.8.0</version>
+          <executions>
+            <execution>
+              <id>default-compile</id>
+              <configuration>
+                <release>9</release>
+              </configuration>
+            </execution>
+            <execution>
+              <id>base-compile</id>
+              <goals>
+                <goal>compile</goal>
+              </goals>
               <configuration>
                 <excludes>
-              <exclude>**/module-info.java</exclude>
+                  <exclude>module-info.java</exclude>
                 </excludes>
-            <source>${java.version}</source>
+              </configuration>
-            <target>${java.version}</target>
+            </execution>
+          </executions>
+          <configuration>
+            <release>6</release>
           </configuration>
         </plugin>
         <plugin>