Hubson异常net.sf.json.JSONException解决

查看异常堆栈貌似跟项目配置和代码没有任何关系，google搜貌似是hudson的bug。找了半天没找到官方解决办法。
于是采用比较旁门左道的解决方案：
http://blog.progs.be/133/hudson-builds-suddenly-fail-due-to-a-bug-in-the-code

"For some reason this is caused by the $HUDSON_HOME/updates/hudson.tasks.Maven.MavenInstaller
file which was empty.
Putting “{}” (an empty JSON object) in there allowed builds to work again."

找HUDSON_HOME找了半天，后来全盘搜才找到，原来hudson启动是会自动建立 ".hudson"文件夹

tomcat中会有提示信息
INFO: Home directory: /root/.hudson
在里面能找到一个文件hudson.tasks.Maven.MavenInstaller
vi 编辑，添加{}
重新运行hudson，问题暂时解决了。

ERROR: Processing failed due to a bug in the code. Please report this to dev@hudson.java.net
net.sf.json.JSONException: A JSONObject text must begin with '{' at character 0 of
at net.sf.json.util.JSONTokener.syntaxError(JSONTokener.java:499)
at net.sf.json.JSONObject._fromJSONTokener(JSONObject.java:972)
at net.sf.json.JSONObject._fromString(JSONObject.java:1201)
at net.sf.json.JSONObject.fromObject(JSONObject.java:165)
at net.sf.json.JSONObject.fromObject(JSONObject.java:134)
at hudson.model.DownloadService$Downloadable.getData(DownloadService.java:195)
at hudson.tools.DownloadFromUrlInstaller$DescriptorImpl.getInstallables(DownloadFromUrlInstaller.java:177)
at hudson.tools.DownloadFromUrlInstaller.getInstallable(DownloadFromUrlInstaller.java:76)
at hudson.tools.DownloadFromUrlInstaller.performInstallation(DownloadFromUrlInstaller.java:87)
at hudson.tools.InstallerTranslator.getToolHome(InstallerTranslator.java:54)
at hudson.tools.ToolLocationNodeProperty.getToolHome(ToolLocationNodeProperty.java:99)
at hudson.tools.ToolInstallation.translateFor(ToolInstallation.java:137)
at hudson.tasks.Maven$MavenInstallation.forNode(Maven.java:510)
at hudson.maven.MavenModuleSetBuild$RunnerImpl.doRun(MavenModuleSetBuild.java:503)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:434)
at hudson.model.Run.run(Run.java:1390)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:414)
at hudson.model.ResourceController.execute(ResourceController.java:82)
at hudson.model.Executor.run(Executor.java:137)
project=MavenModuleSet[xxx]
project.getModules()=[]
project.getRootModule()=null
FATAL: A JSONObject text must begin with '{' at character 0 of
net.sf.json.JSONException: A JSONObject text must begin with '{' at character 0 of
at net.sf.json.util.JSONTokener.syntaxError(JSONTokener.java:499)
at net.sf.json.JSONObject._fromJSONTokener(JSONObject.java:972)
at net.sf.json.JSONObject._fromString(JSONObject.java:1201)
at net.sf.json.JSONObject.fromObject(JSONObject.java:165)
at net.sf.json.JSONObject.fromObject(JSONObject.java:134)
at hudson.model.DownloadService$Downloadable.getData(DownloadService.java:195)
at hudson.tools.DownloadFromUrlInstaller$DescriptorImpl.getInstallables(DownloadFromUrlInstaller.java:177)
at hudson.tools.DownloadFromUrlInstaller.getInstallable(DownloadFromUrlInstaller.java:76)
at hudson.tools.DownloadFromUrlInstaller.performInstallation(DownloadFromUrlInstaller.java:87)
at hudson.tools.InstallerTranslator.getToolHome(InstallerTranslator.java:54)
at hudson.tools.ToolLocationNodeProperty.getToolHome(ToolLocationNodeProperty.java:99)
at hudson.tools.ToolInstallation.translateFor(ToolInstallation.java:137)
at hudson.tasks.Maven$MavenInstallation.forNode(Maven.java:510)
at hudson.maven.MavenModuleSetBuild$RunnerImpl.doRun(MavenModuleSetBuild.java:503)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:434)
at hudson.model.Run.run(Run.java:1390)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:414)
at hudson.model.ResourceController.execute(ResourceController.java:82)
at hudson.model.Executor.run(Executor.java:137)