if (!(o instanceof CacheKey)) {
                return false;
            }

            CacheKey other = (CacheKey) o;

            return ids.equals(other.ids)
                    && files.equals(other.files)
                    && timestamps.equals(other.timestamps)
                    && sizes.equals(other.sizes);
        }

        @Override
        public String toString() {
            return files.toString();

 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION

damages for loss of goodwill, work stoppage, computer failure or malfunction, or any and all other commercial damages or losses), even if such Contributor has been advised of the possibility of such damages. 9. Accepting Warranty or Additional Liability. While redistributing the Work or Derivative Works thereof, You may choose to offer, and charge a fee for, acceptance of support, warranty, indemnity, or other liability obligations and/or rights consistent with this License. However, in accepting such...

            return true;
        }

        if (!(obj instanceof InversionArtifactFilter)) {
            return false;
        }

        InversionArtifactFilter other = (InversionArtifactFilter) obj;

        return toInvert.equals(other.toInvert);
    }

        if (this == obj) {
            return true;
        }

        if (!(obj instanceof AndArtifactFilter)) {
            return false;
        }

        AndArtifactFilter other = (AndArtifactFilter) obj;

        return filters.equals(other.filters);
    }

        if (obj == null || getClass() != obj.getClass()) {
            return false;
        }

        IncludesArtifactFilter other = (IncludesArtifactFilter) obj;

        return patterns.equals(other.patterns);
    }

            return false;
        }

        if (!StringSource.class.equals(obj.getClass())) {
            return false;
        }

        StringSource other = (StringSource) obj;
        return this.content.equals(other.content);
    }

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  <artifactId>test1</artifactId>
  <version>0.1</version>

  <name>Maven Integration Test :: MNG-4000</name>
  <description>
    Test that plugin executions without id are not lost among other plugin executions.
  </description>

  <build>
    <!-- NOTE: This test does not use plugin management for the IT plugin. -->
    <plugins>
      <plugin>
        <groupId>org.apache.maven.its.plugins</groupId>

         * This must not be confused with {@link #root(DependencyCoordinate)}: The root dependency, like any
         * other specified dependency, will be subject to dependency collection/resolution, i.e. should have an artifact
         * descriptor and a corresponding artifact file. The root artifact on the other hand is only used
         * as a label for the root node of the graph in case no root dependency was specified. As such, the configured