Release prepare failure when the project contains a system scope dependency

Release prepare fails for a project containing a org.apache.camel:camel-core:jar:2.2.0 dependency.

Following is the output:

[INFO] Updating local copy against the scm...
[ERROR] org.apache.maven.shared.release.ReleaseExecutionException: Unable to get reactor projects: Failed to build project.
at org.apache.maven.continuum.release.phase.GenerateReactorProjectsPhase.execute(GenerateReactorProjectsPhase.java:82)
at org.apache.maven.shared.release.DefaultReleaseManager.prepare(DefaultReleaseManager.java:194)
at org.apache.maven.shared.release.DefaultReleaseManager.prepareWithResult(DefaultReleaseManager.java:107)
at org.apache.maven.continuum.release.executors.PrepareReleaseTaskExecutor.execute(PrepareReleaseTaskExecutor.java:43)
at org.apache.maven.continuum.release.executors.AbstractReleaseTaskExecutor.executeTask(AbstractReleaseTaskExecutor.java:67)
at org.codehaus.plexus.taskqueue.execution.ThreadedTaskQueueExecutor$ExecutorRunnable$1.run(ThreadedTaskQueueExecutor.java:116)
at edu.emory.mathcs.backport.java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:442)
at edu.emory.mathcs.backport.java.util.concurrent.FutureTask.run(FutureTask.java:178)
at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1061)
at edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:575)
at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.maven.continuum.release.ContinuumReleaseException: Failed to build project.
at org.apache.maven.continuum.release.phase.GenerateReactorProjectsPhase.getReactorProjects(GenerateReactorProjectsPhase.java:123)
at org.apache.maven.continuum.release.phase.GenerateReactorProjectsPhase.execute(GenerateReactorProjectsPhase.java:78)
... 10 more
Caused by: org.apache.maven.artifact.resolver.MultipleArtifactsNotFoundException: Missing:
----------
1) com.sun:tools:jar:1.5.0

Try downloading the file manually from the project website.

Then, install it using the command:
mvn install:install-file -DgroupId=com.sun -DartifactId=tools -Dversion=1.5.0 -Dpackaging=jar -Dfile=/path/to/file

Alternatively, if you host your own repository you can deploy the file there:
mvn deploy:deploy-file -DgroupId=com.sun -DartifactId=tools -Dversion=1.5.0 -Dpackaging=jar -Dfile=/path/to/file -Durl=[url] -DrepositoryId=[id]

Path to dependency:
1) test:test:pom:0.0.3-SNAPSHOT
2) org.apache.camel:camel-core:jar:2.2.0
3) com.sun:tools:jar:1.5.0

----------
1 required artifact is missing.

for artifact:
test:test:pom:0.0.3-SNAPSHOT

from the specified remote repositories:
klaverblad-mirror-repository (http://cib01.klaverblad.nl/binaries/mirror),
central (http://repo1.maven.org/maven2),
klaverblad-snapshot-repository (http://cib01.klaverblad.nl/binaries/snapshots),
klaverblad-release-repository (http://cib01.klaverblad.nl/binaries/releases)

at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolveTransitively(DefaultArtifactResolver.java:324)
at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolveTransitively(DefaultArtifactResolver.java:288)
at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolveTransitively(DefaultArtifactResolver.java:269)
at org.apache.maven.project.DefaultMavenProjectBuilder.buildWithDependencies(DefaultMavenProjectBuilder.java:395)
at org.apache.maven.project.DefaultMavenProjectBuilder.buildWithDependencies(DefaultMavenProjectBuilder.java:343)
at org.apache.maven.continuum.release.phase.GenerateReactorProjectsPhase.getReactorProjects(GenerateReactorProjectsPhase.java:106)
... 11 more

The project can however be released manually using the appropriate maven commands. This can be reproduced using a simple test pom file:

<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>
<groupId>test</groupId>
<artifactId>test</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>pom</packaging>
<name>Test</name>
<description />

<scm>
...
</scm>

<dependencies>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-core</artifactId>
<version>2.2.0</version>
</dependency>
</dependencies>

</project>