It's hard to see what the problem actually is. I see you've created a test 
project, can you share it? That would help to reproduce and track the error.

On Friday, August 19, 2016 at 1:06:56 PM UTC+3, Alberto Mancini wrote:
>
> Hello,
> we have still the same problem with SourceMaps.
> A teammate tracked down the problem and we found that the error appears if we 
> depend on  gwt-dev (rc1 or rc2) and errai.
>
> ---------------
>  Job com.testcase.sourcemap.App_1_0
> [INFO]       Linking into 
> /var/folders/n8/8w8npfys46x90q0y9lqdxb0h0000gn/T/gwt-codeserver-4222675233479416644.tmp/com.testcase.sourcemap.App/compile-2/war/app;
>  
> Writing extras to 
> /var/folders/n8/8w8npfys46x90q0y9lqdxb0h0000gn/T/gwt-codeserver-4222675233479416644.tmp/com.testcase.sourcemap.App/compile-2/extras/app
> [INFO]          [WARN] Can't write source map 
> D84F40D38A264502877474A1394B6135_sourceMap0.json
> [INFO] java.lang.NullPointerException
> [INFO] at 
> com.google.gwt.thirdparty.debugging.sourcemap.SourceMapConsumerV3.parse(SourceMapConsumerV3.java:101)
> ....
> ----------------
>
> Am I missing something trivial ? 
> Should i file a bug on gwt-2.8.0-rc2  or errai beta2?
>
> Follows the sample  pom.
>
> Thanks,
>    Alberto.
>
> ----
>
> <?xml version="1.0" encoding="UTF-8"?>
> <project xmlns="http://maven.apache.org/POM/4.0.0";
>          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
>          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
> http://maven.apache.org/xsd/maven-4.0.0.xsd";>
>     <modelVersion>4.0.0</modelVersion>
>
>     <groupId>com.testcase</groupId>
>     <artifactId>sourcemap</artifactId>
>     <version>1.0-SNAPSHOT</version>
>     <packaging>war</packaging>
>
>     <properties>
>         <errai.version>4.0.0.Beta2</errai.version>
>         <gwt.version>2.8.0-rc2</gwt.version>
>     </properties>
>
>     <repositories>
>         <repository>
>             <id>jboss</id>
>             <name>JBoss Public Repo</name>
>             
> <url>https://repository.jboss.org/nexus/content/groups/public</url>
>         </repository>
>     </repositories>
>
>
>
>     <dependencies>
>         <!-- GWT -->
>         <dependency>
>             <groupId>com.google.gwt</groupId>
>             <artifactId>gwt-user</artifactId>
>             <version>${gwt.version}</version>
>             <scope>provided</scope>
>         </dependency>
>         <!-- it works if commented -->
>         <dependency>
>             <groupId>com.google.gwt</groupId>
>             <artifactId>gwt-dev</artifactId>
>             <version>${gwt.version}</version>
>             <scope>provided</scope>
>         </dependency>
>         <!-- -->
>     </dependencies>
>
>
>     <build>
>         <finalName>${project.artifactId}</finalName>
>         <resources>
>             <resource>
>                 <directory>src/main/java</directory>
>             </resource>
>         </resources>
>
>         <plugins>
>             <plugin>
>                 <artifactId>maven-compiler-plugin</artifactId>
>                 <version>3.5.1</version>
>                 <configuration>
>                     <source>1.8</source>
>                     <target>1.8</target>
>                 </configuration>
>             </plugin>
>             <plugin>
>                 <artifactId>maven-clean-plugin</artifactId>
>                 <version>2.4.1</version>
>                 <configuration>
>                     <filesets>
>                         <fileset>
>                             <directory>${basedir}</directory>
>                             <includes>
>                                 <include>src/gen/</include>
>                                 <include>src/main/webapp/app/</include>
>                                 
> <include>src/main/webapp/WEB-INF/deploy/</include>
>                                 
> <include>src/main/webapp/WEB-INF/lib/</include>
>                                 
> <include>src/main/webapp/WEB-INF/classes/**/*.*</include>
>                                 
> <include>src/main/webapp/WEB-INF/classes/**/*</include>
>                                 
> <include>src/main/webapp/WEB-INF/classes</include>
>                                 <include>**/gwt-unitCache/**</include>
>                                 <include>.errai/</include>
>                             </includes>
>                         </fileset>
>                     </filesets>
>                 </configuration>
>             </plugin>
>             <plugin>
>                 <artifactId>maven-war-plugin</artifactId>
>                 <version>2.6</version>
>             </plugin>
>             <plugin>
>                 <groupId>org.codehaus.mojo</groupId>
>                 <artifactId>gwt-maven-plugin</artifactId>
>                 <version>2.8.0-rc1</version>
>                 <executions>
>                     <execution>
>                         <goals>
>                             <goal>compile</goal>
>                         </goals>
>                     </execution>
>                 </executions>
>                 <configuration>
>                     <bindAddress>0.0.0.0</bindAddress>
>                     <logLevel>WARN</logLevel>
>                     <strict>true</strict>
>                     <noServer>false</noServer>
>                     <generateDirectory>src/gen/java</generateDirectory>
>                     <gen>src/gen/java</gen>
>                     
> <webappDirectory>${project.basedir}/src/main/webapp</webappDirectory>
>                     
> <hostedWebapp>${project.basedir}/src/main/webapp</hostedWebapp>               
>      <runTarget>/</runTarget>
>                     <extraJvmArgs>-Xmx2048m 
> -XX:CompileThreshold=700</extraJvmArgs>
>                     <strict>true</strict>
>                 </configuration>
>                 <dependencies>
>                     <dependency>
>                         <groupId>com.google.gwt</groupId>
>                         <artifactId>gwt-user</artifactId>
>                         <version>${gwt.version}</version>
>                     </dependency>
>                     <dependency>
>                         <groupId>com.google.gwt</groupId>
>                         <artifactId>gwt-dev</artifactId>
>                         <version>${gwt.version}</version>
>                         <scope>compile</scope>
>                     </dependency>
>                 </dependencies>
>             </plugin>
>         </plugins>
>     </build>
>
>     <profiles>
>         <profile>
>             <id>errai</id>
>             <activation>
>                 <activeByDefault>true</activeByDefault>
>             </activation>
>             <dependencyManagement>
>                 <dependencies>
>                     <dependency>
>                         <groupId>org.jboss.errai.bom</groupId>
>                         <artifactId>errai-bom</artifactId>
>                         <version>${errai.version}</version>
>                         <type>pom</type>
>                         <scope>import</scope>
>                     </dependency>
>                 </dependencies>
>             </dependencyManagement>
>             <dependencies>
>                 <!--errai-->
>                 <!--<dependency>-->
>                     <!--<groupId>org.jboss.errai</groupId>-->
>                     <!--<artifactId>errai-navigation</artifactId>-->
>                     <!--<version>${errai.version}</version>-->
>                     <!--<scope>provided</scope>-->
>                 <!--</dependency>-->
>                 <!--
>                 <dependency>
>                     <groupId>org.jboss.errai</groupId>
>                     <artifactId>errai-ioc</artifactId>
>                     <version>${errai.version}</version>
>                     <scope>provided</scope>
>                 </dependency>
>                 <dependency>
>                     <groupId>org.jboss.errai</groupId>
>                     <artifactId>errai-ui</artifactId>
>                     <version>${errai.version}</version>
>                     <scope>provided</scope>
>                 </dependency>
>                 <dependency>
>                     <groupId>org.jboss.errai</groupId>
>                     <artifactId>errai-data-binding</artifactId>
>                     <version>${errai.version}</version>
>                     <scope>provided</scope>
>                 </dependency>
>                 <dependency>
>                     <groupId>org.jboss.errai</groupId>
>                     <artifactId>errai-cdi-client</artifactId>
>                     <version>${errai.version}</version>
>                     <scope>provided</scope>
>                 </dependency>
>                 <dependency>
>                     <groupId>org.jboss.errai</groupId>
>                     <artifactId>errai-bus</artifactId>
>                     <version>${errai.version}</version>
>                     <scope>provided</scope>
>                 </dependency>
>                 -->
>             </dependencies>
>         </profile>
>     </profiles>
>
>
> </project>
>
>

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