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https://issues.apache.org/jira/browse/WW-5546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17950180#comment-17950180
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Lukasz Lenart commented on WW-5546:
-----------------------------------
[~jesusmca] I assume you are referring to Struts 7.0.3 as there is no such
version as 2.7.0.3. I also assume you have migrated from previous version of
Struts (2.5.x or 6.x) to 7.x - if so, did you followed the migration guide and
switched to Action File Upload Interceptor? This requires to implement a
dedicated interface by your action. There is no support for an ordinary
{{File}} anymore as you presenting in your {{UploadVO}}.
https://cwiki.apache.org/confluence/display/WW/Struts+6.x.x+to+7.x.x+migration#Struts6.x.xto7.x.xmigration-Fileupload
> NPE in AbstractFileUploadInterceptor
> ------------------------------------
>
> Key: WW-5546
> URL: https://issues.apache.org/jira/browse/WW-5546
> Project: Struts 2
> Issue Type: Bug
> Components: Core, Core Interceptors
> Affects Versions: 6.7.4
> Reporter: Barta Tamás
> Assignee: Lukasz Lenart
> Priority: Major
> Fix For: 6.8.0, 7.1.0
>
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> I got the following exception:
>
> {code:java}
> java.lang.NullPointerException: Cannot invoke "java.io.File.length()" because
> "this.file" is null
> at
> deployment.deployment.ear//org.apache.struts2.dispatcher.multipart.StrutsUploadedFile.length(StrutsUploadedFile.java:52)
> at
> deployment.deployment.ear//org.apache.struts2.interceptor.AbstractFileUploadInterceptor.acceptFile(AbstractFileUploadInterceptor.java:133)
> at
> deployment.deployment.ear//org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:232)
> at
> deployment.deployment.ear//com.opensymphony.xwork2.interceptor.AbstractInterceptor.intercept(AbstractInterceptor.java:36)
> at
> deployment.deployment.ear//com.opensymphony.xwork2.DefaultActionInvocation.executeConditional(DefaultActionInvocation.java:303)
> {code}
> I think the bug is in AbstractFileUploadInterceptor:
>
>
> {code:java}
> if (file.getContent() == null) {
> String errMsg = getTextMessage(action,
> STRUTS_MESSAGES_ERROR_UPLOADING_KEY, new String[]{originalFilename});
>
> errorMessages.add(errMsg);
> LOG.warn(errMsg);
> }
> if (maximumSize != null && maximumSize < file.length()) { {code}
> If file.getContent() is null (which means StrutsUploadedFile.file is null),
> then warning is logged but there is no "return false" so execution continues
> and file.length() will throw NPE as file is null in StrutsUploadedFile.
>
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