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我正在开发一个在java中的谷歌应用程序，但是我收到这个错误：java.io.FileOutputStream is a restricted class只有 当我尝试上传比其他人更大的csv文件时。 所有工作正常，当我上传文件像5-6kb，我得到30kb文件的错误。 我导入了所有库，当然还有一些教程/问题，但我不知道要解决这个问题。在servlet的NoClassDefFoundError：java.io.FileOutputStream是一个受限制的类
代码：
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setFileSizeMax(50000);
upload.setSizeMax(50000);
List<FileItem> items = upload.parseRequest(req); // <-- error line (48)
java.lang.NoClassDefFoundError: java.io.FileOutputStream is a restricted class. Please see the Google App Engine developer's guide for more details.
at com.google.appengine.tools.development.agent.runtime.Runtime.reject(Runtime.java:50)
at org.apache.commons.io.output.DeferredFileOutputStream.thresholdReached(DeferredFileOutputStream.java:178)
at org.apache.commons.io.output.ThresholdingOutputStream.checkThreshold(ThresholdingOutputStream.java:224)
at org.apache.commons.io.output.ThresholdingOutputStream.write(ThresholdingOutputStream.java:128)
at org.apache.commons.fileupload.util.Streams.copy(Streams.java:108)
at org.apache.commons.fileupload.util.Streams.copy(Streams.java:70)
at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:347)
at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:115)
at it.injenia.gestionefirme.servlet.uploadkind.UploadKind.doPost(UploadKind.java:48)