MyEclipse 解決 Errors running builder 'DeploymentBuilder' on project

MyEclipse儲存.java檔案并自動編譯時報錯：

Errors occurred during the build.

Errors running builder 'DeploymentBuilder' on project '項目名'.

java.lang.NullPointerException

産生此錯誤的原因：此項目不不是由MyEclipse建立；

是以你需要檢查.project檔案，添加 <nature>com.genuitec.eclipse.j2eedt.core.webnature</nature>

然後重新打開項目。