2 exec-maven-plugin defined in POM - not working - maven

Question

I have two Java main classes that I need executed during different parts of a build process. One needs to execute ALWAYS as part of my standard build process during the generate-sources phase. The other needs to execute as part of a profile, but that profile should be execute at the end of the process-classes phase, which should also include the generate-sources phase prior to that.
I was able to get the first plugin working correctly during the generate-sources phase of the standard build process:
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<executions>
<execution>
<phase>generate-sources</phase>
<goals>
<goal>java</goal>
</goals>
</execution>
</executions>
<configuration>
<mainClass>com.example.MySourceGenerator</mainClass>
</configuration>
</plugin>
However when I added a second instance of the same plugin to the profile, the plugin defined as part of the standard build is no longer invoked during my build process, resulting in compile errors. This is the configuration in the profile:
<profiles>
<profile>
<id>initSchema</id>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<executions>
<execution>
<phase>process-classes</phase>
<goals>
<goal>java</goal>
</goals>
</execution>
</executions>
<configuration>
<mainClass>com.example.SomeOtherClass</mainClass>
</configuration>
</plugin>
</plugins>
</build>
</profile>
</profiles>
This is what I run on the command line: mvn process-classes -PinitSchema. What is wrong with my configuration? I am expecting both plugins to execute during their respective phases.
To clarify: the first exec-maven-plugin generates sources and the second one initialized my DB schema.
EDIT:
Here is the output
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building ABC Web Application 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
...
[INFO] --- build-helper-maven-plugin:1.8:add-source (add-source) # web-app ---
[INFO] Source directory: /Users/wendyschmitz/projects/ae/abc-proj/web-app/target/generated-sources/msg added.
[INFO]
[INFO] --- maven-processor-plugin:2.0.6:process (process) # web-app ---
[INFO] Source directory: /Users/wendyschmitz/projects/ae/abc-proj/web-app/target/generated-sources/apt added
[INFO] javac option: -cp
...
[INFO] javac option: -proc:only
[INFO] javac option: -processor
[INFO] javac option: com.company.vocab.generator.VocabAnnotationProcessor,org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor
[INFO] javac option: -d
[INFO] javac option: /Users/wendyschmitz/projects/ae/abc-proj/web-app/target/classes
[INFO] javac option: -s
[INFO] javac option: /Users/wendyschmitz/projects/ae/abc-proj/web-app/target/generated-sources/apt
[INFO] diagnostic Note: Hibernate JPA 2 Static-Metamodel Generator 1.2.0.Final
[INFO] diagnostic /Users/wendyschmitz/projects/ae/abc-proj/web-app/src/main/java/com/company/service/dto/AccountDto.java:5: error: cannot find symbol
import com.telos.xacta.util.Messages;
...
(more similar messages)
[INFO]
[INFO] --- jaxb2-maven-plugin:1.5:xjc (default) # web-app ---
[INFO] Generating source...
[INFO] parsing a schema...
[INFO] compiling a schema...
...
[INFO] --- maven-resources-plugin:2.4.3:resources (default-resources) # web-app ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 16 resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) # web-app ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 281 source files to /Users/wendyschmitz/projects/ae/abc-proj/web-app/target/classes
[INFO] -------------------------------------------------------------
...
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /Users/wendyschmitz/projects/ae/abc-proj/web-app/src/main/java/com/company/service/dto/ProjectHeadDto.java:[4,28] cannot find symbol
symbol: class Messages
location: package com.company.util
...
(more similar errors)
...
[INFO] 29 errors
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 8.817s
[INFO] Finished at: Thu Aug 01 20:49:07 EDT 2013
[INFO] Final Memory: 31M/282M
[INFO] ------------------------------------------------------------------------

Answer 1

Give both the execution blocks a different id, because now they both use the default id and so one will overwrite the other.