Ignore Java files in `node_modules/` on the build phase.

fixes #11822.

Signed-off-by: Masaki Muranaka <monaka@monami-ya.com>

dashboard/pom.xml

@@ -36,6 +36,15 @@
     <build>
         <finalName>dashboard-war</finalName>
         <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <excludes>
+                        <exclude>node_modules/**/*.java</exclude>
+                    </excludes>
+                </configuration>
+            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-war-plugin</artifactId>