Your src appears not to live underneath a subpackage called 'client',but you'll need to use the <src> directive in your module to make it accessible - gwt

Question

I am using GWT 2.9.0 + GXT 4.1.0 + Java 11 combination. I am getting below error
[ERROR] Hint: Your source appears not to live underneath a subpackage called 'client'; no problem, but you'll need to use the directive in your module to make it accessible
ProjectName. Below is my project structure in package explorer in eclipse. I am getting the error when trying to run my application in super dev mode through gwt eclipse plugin in eclipse IDE. Can you help me in resolving the issue
MavenProjectName
src/main/java ----> This is empty
src/main/src-client
com.cname.proj
Main.java
Main.gwt.xml
com.cname.proj.client.centerpanelscreens
com.cname.proj.client.command
com.cname.proj.service
src/main/src-common
com.cname.proj
Common.gwt.xml
com.cname.proj.model
com.cname.proj.model.to
com.cname.proj.service
com.cname.proj.util
src/main/webapp
index.html
src/main/webapp/WEB-INF
web.xml
Content below in Main.gwt.xml
<module rename-to="js">
<inherits name='com.google.gwt.user.User'/>
<inherits name='com.google.gwt.user.theme.clean.Clean'/>
<inherits name='com.cname.proj.Common' />
<inherits name='com.sencha.gxt.ui.GXT'/>
<entry-point class='com.cname.proj.Main' />
<source path="client" />
<source path="service"/>
</module>
Content below in Common.gwt.xml
<module>
<inherits name='com.sencha.gxt.ui.GXT'/>
<source path="model"/>
<source path="service" />
<source path="util">
</source>
GWT Logs
Resolving javax.validation.constraints.Pattern
Resolving javax.validation.constraints.Pattern.Flag
Found type 'javax.validation.constraints.Pattern.Flag'
Resolving method <clinit>
Resolving method <init>
Resolving method getValue
Resolving method values
Resolving method valueOf
Resolving field UNIX_LINES
Resolving field CASE_INSENSITIVE
Resolving field COMMENTS
Resolving field MULTILINE
Resolving field DOTALL
Resolving field UNICODE_CASE
Resolving field CANON_EQ
Resolving field value
Resolving javax.validation.constraints.Pattern.List
Found type 'javax.validation.constraints.Pattern.List'
Resolving annotation for java.lang.annotation.Target
Resolving annotation for java.lang.annotation.Retention
Resolving annotation for java.lang.annotation.Documented
Resolving method value
Resolving javax.validation.spi.ConfigurationState
Finding entry point classes
Tracing compile failure path for type 'com.cname.proj.Main'
Checked 0 dependencies for errors.
[ERROR] Hint: Your source appears not to live underneath a subpackage called 'client'; no problem, but you'll need to use the <source> directive in your module to make it accessible
Closing cache file: C:\gwt-unitCache\gwt-unitCache-b9eb8fcc22822eac5087fcda1c6dcb20c0796e62-18CAE75E829AF224BF18DEE97AC379EF-00000181BAD760BD (0 units written)
Deleting empty file: C:\gwt-unitCache\gwt-unitCache-b9eb8fcc22822eac5087fcda1c6dcb20c0796e62-18CAE75E829AF224BF18DEE97AC379EF-00000181BAD760BD
Shutting down PersistentUnitCache thread
Shutting down PersistentUnitCache thread
POM.xml with the required legacy plugin
<plugins>
<!-- GWT Maven Plugin -->
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>gwt-maven-plugin</artifactId>
<version>2.9.0</version>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>test</goal>
<!-- goal>generateAsync</goal> -->
</goals>
</execution>
</executions>
<!-- Plugin configuration. There are many available options, see gwt-maven-plugin
documentation at codehaus.org -->
<configuration>
<!-- module>com.msci.dm.gis.gwt.Main</module-->
<runTarget>Main.html</runTarget>
<debugPort>8998</debugPort>
<hostedWebapp>${webappDirectory}</hostedWebapp>
<extraJvmArgs>-Xmx512M -Xss1024k</extraJvmArgs>
</configuration>`enter code here`
</plugin>

Answer 1

Tracing compile failure path for type 'com.cname.proj.Main'
Checked 0 dependencies for errors.
[ERROR] Hint: Your source appears not to live underneath a subpackage called 'client'; no problem, but you'll need to use the <source> directive in your module to make it accessible
Your .gwt.xml files both live in com/cname/proj/, and only lists these sub-packages as sources:
<source path="client" />
<source path="service" />
...
<source path="model" />
<source path="service" />
<source path="util" />
(note that you have "service" listed twice, both .gwt.xml files claim that the server package is part of its own module).
Since no module is claiming the top-level package of com.cname.proj, that source file will not be available at compile time.
The expected pattern is to only list packages that are expected for the compiler to transform all of their contents into JS. Typically, this is the client sub-package, but convention often suggests that a shared sub-package may exist too, consisting of code shared between the server and client. There is no problem with listing others like service, model, util, and you technically can also just list the empty string to indicate the entire current package and all subpackages:
<source path="" />
With all of that said, the best option is to move Main into com.cname.proj.client, since it is almost certainly exclusively a client class.