运行hibernate jpamodelgen Maven插件时收到一些奇怪的警告

我正在使用Maven 3.1.1和Hibernate 4.1.0.Final。我用这个目标来生成JPA元数据模型

        <plugin>
            <groupId>org.bsc.maven</groupId>
            <artifactId>maven-processor-plugin</artifactId>
            <version>2.1.1</version>
            <executions>
                <execution>
                    <id>process</id>
                    <goals>
                        <goal>process</goal>
                    </goals>
                    <phase>generate-sources</phase>
                    <configuration>
                        <processors>
                            <processor>org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor</processor>
                        </processors>
                    </configuration>
                </execution>
            </executions>
            <dependencies>
                <dependency>
                    <groupId>org.hibernate</groupId>
                    <artifactId>hibernate-jpamodelgen</artifactId>
                    <version>1.2.0.Final</version>
                </dependency>
            </dependencies>
        </plugin>

虽然我的构建最终完成得很好，但我想知道如何消除这些警告

[INFO] javac option: -proc:only
[INFO] javac option: -processor
[INFO] javac option: org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor
[INFO] javac option: -d
[INFO] javac option: /Users/davea/Dropbox/workspace/core/target/classes
[INFO] javac option: -s
[INFO] javac option: /Users/davea/Dropbox/workspace/core/target/generated-sources/apt
[INFO] diagnostic /Users/davea/Dropbox/workspace/core/src/main/java/org/mainco/subco/myitem/queue/repo/MyItemDaoImpl.java:27:   cannot find symbol
symbol  : class MyItem_
location: package org.mainco.subco.myproj.queue.domain
[INFO] diagnostic /Users/davea/Dropbox/workspace/core/src/main/java/org/mainco/subco/assessment/dao/AssessmentDao.java:15: cannot find  symbol
symbol  : class SubItem_
location: package org.mainco.subco.secondproj.domain
[INFO] diagnostic /Users/davea/Dropbox/workspace/core/src/main/java/org/mainco/subco/secondproj/dao/SubItemDao.java:17: cannot find     symbol
symbol  : class NextItem_