cobertura-maven-plugin从2.6更新到2.7后， Cobertura插件与FindBugs插件发生冲突。FindBugs插件在cobertura仪表代码中检测到错误：
[INFO] Incorrect lazy initialization of static field pl.chilldev.sites.commons.ErrorCode.__cobertura_counters in pl.chilldev.sites.commons.ErrorCode.__cobertura_init() [pl.chilldev.sites.commons.ErrorCode] In ErrorCode.java
（将Cobertura插件版本设置为2.6时，一切正常）
以防万一，FindBugs插件版本为3.0.1。
是否可以将这些插件设置为以某种方式协同工作？
这是pom.xml主项目目录（子模块仅包含依赖项列表）：
<?xml version="1.0" encoding="utf-8"?>
<!--
# This file is part of the pl.chilldev.sites.
#
# @copyright 2015 © by Rafał Wrzeszcz - Wrzasq.pl.
-->
<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/maven-v4_0_0.xsd
">
<modelVersion>4.0.0</modelVersion>
<!-- core project settings -->
<groupId>pl.chilldev.sites</groupId>
<artifactId>sites</artifactId>
<packaging>pom</packaging>
<version>0.0.1-SNAPSHOT</version>
<!-- project meta info -->
<name>ChillDev-Sites</name>
<url><!-- TODO --></url>
<description>Content sites storage service.</description>
<inceptionYear>2015</inceptionYear>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<organization>
<name>Rafał Wrzeszcz - Wrzasq.pl</name>
<url>http://wrzasq.pl/</url>
</organization>
<!-- plugins configuration -->
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.6</version>
<configuration>
<archive>
<index>true</index>
<manifest>
<addClasspath>true</addClasspath>
</manifest>
<manifestEntries>
<url>${project.url}</url>
<Specification-Title>${project.name}</Specification-Title>
<Specification-Version>${project.version}</Specification-Version>
<Specification-Vendor>Rafał Wrzeszcz - Wrzasq.pl; Chillout Development</Specification-Vendor>
<Implementation-Title>${project.name}</Implementation-Title>
<Implementation-Version>${project.version}</Implementation-Version>
<Implementation-Vendor>Rafał Wrzeszcz - Wrzasq.pl; Chillout Development</Implementation-Vendor>
</manifestEntries>
</archive>
</configuration>
</plugin>
</plugins>
</pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
<compilerArgs>
<arg>-Xlint:all</arg>
</compilerArgs>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>2.7</version>
<configuration>
<escapeString>\</escapeString>
</configuration>
<executions>
<execution>
<goals>
<goal>resources</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-pmd-plugin</artifactId>
<version>3.4</version>
<executions>
<execution>
<goals>
<goal>check</goal>
<goal>cpd-check</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-checkstyle-plugin</artifactId>
<version>2.15</version>
<dependencies>
<!-- Maven Checkstyle plugin has a 6.1.1 version by default which is buggy -->
<dependency>
<groupId>com.puppycrawl.tools</groupId>
<artifactId>checkstyle</artifactId>
<version>6.5</version>
</dependency>
</dependencies>
<configuration>
<configLocation>src/main/checkstyle/checkstyle.xml</configLocation>
<propertyExpansion>checkstyle.project.basedir=${project.basedir}</propertyExpansion>
</configuration>
<executions>
<execution>
<goals>
<goal>check</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-site-plugin</artifactId>
<version>3.4</version>
<dependencies>
<dependency>
<groupId>org.apache.maven.doxia</groupId>
<artifactId>doxia-module-markdown</artifactId>
<version>1.6</version>
</dependency>
<dependency>
<groupId>lt.velykis.maven.skins</groupId>
<artifactId>reflow-velocity-tools</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<groupId>org.apache.velocity</groupId>
<artifactId>velocity</artifactId>
<version>1.7</version>
</dependency>
</dependencies>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-pdf-plugin</artifactId>
<version>1.3</version>
<!-- TODO:
- fix rendering of company and project logos
- add UTF-8 font
-->
<executions>
<execution>
<phase>site</phase>
<goals>
<goal>pdf</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
<version>2.4</version>
<executions>
<execution>
<goals>
<goal>jar-no-fork</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<version>2.10.2</version>
<executions>
<execution>
<goals>
<goal>jar</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>findbugs-maven-plugin</artifactId>
<version>3.0.1</version>
<configuration>
<effort>Max</effort>
<threshold>Low</threshold>
</configuration>
<executions>
<execution>
<goals>
<goal>check</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
</build>
<!-- reporting plugins -->
<reporting>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-project-info-reports-plugin</artifactId>
<version>2.8</version>
<configuration>
<dependencyLocationsEnabled>false</dependencyLocationsEnabled>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<version>2.10.2</version>
<configuration>
<show>private</show>
<excludePackageNames>test.pl.chilldev.sites.*</excludePackageNames>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-pmd-plugin</artifactId>
<version>3.4</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-checkstyle-plugin</artifactId>
<version>2.15</version>
<configuration>
<configLocation>src/main/checkstyle/checkstyle.xml</configLocation>
<propertyExpansion>checkstyle.project.basedir=${project.basedir}</propertyExpansion>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jxr-plugin</artifactId>
<version>2.5</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-report-plugin</artifactId>
<version>2.18.1</version>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>cobertura-maven-plugin</artifactId>
<!-- TODO: 2.7 doesn't work well with Findbugs -->
<version>2.6</version>
<configuration>
<formats>
<format>html</format>
</formats>
<instrumentation>
<excludes>
<exclude>test/**/*.class</exclude>
</excludes>
</instrumentation>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>findbugs-maven-plugin</artifactId>
<version>3.0.1</version>
<configuration>
<effort>Max</effort>
<threshold>Low</threshold>
</configuration>
</plugin>
</plugins>
</reporting>
<!-- project dependencies -->
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
</dependencies>
<!-- components of the project -->
<modules>
<module>sites-backend</module>
<module>sites-commons</module>
<module>sites-core</module>
<module>sites-frontend</module>
<module>sites-rpc-client-backend</module>
<module>sites-rpc-client-frontend</module>
<module>sites-rpc-service</module>
</modules>
</project>
package pl.chilldev.sites.commons;
/**
* JSON-RPC error codes.
*/
public class ErrorCode
{
/**
* Dummy code that represents successful operation - should not be used at all.
*/
public static final int OK = 0;
/**
* No entity of specified ID exists.
*/
public static final int NO_ENTITY = 1;
}
Cobertura 2.7进行了更改project.build.outputDirectory，以生成用于集成测试的报告（2.7中引入了新的报告类型）。在下一步中，Findbugs不仅检查已编译类的违规情况，还检查已检测的违规情况。
查看错误：
http://jira.codehaus.org/browse/MCOBERTURA-203
作为解决方法，您可以覆盖classFilesDirectory：
...
<build>
...
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>findbugs-maven-plugin</artifactId>
<version>3.0.1</version>
<configuration>
<effort>Max</effort>
<threshold>Low</threshold>
<classFilesDirectory>${project.build.outputDirectory}</classFilesDirectory>
</configuration>
<executions>
<execution>
<goals>
<goal>check</goal>
</goals>
</execution>
</executions>
</plugin>
...
</build>
...
另一个解决方案是跳过集成测试报告，而仅继续进行单元测试报告：
http://mojo.codehaus.org/cobertura-maven-plugin/usage.html#Using_different_reports
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