java第二次使用PdfReader打开同一个pdf文件时报错The document has no catalog object (meaning: it's an invalid PDF).
时间: 2024-02-25 21:57:48 浏览: 22
这个错误通常是由于在第一次打开 PDF 文件时没有正确关闭 PdfReader 对象导致的。为了避免这个问题,建议在使用完 PdfReader 对象后,调用其 close() 方法关闭对象。例如:
```
PdfReader reader = new PdfReader("path/to/your/pdf");
// do something with reader
reader.close(); // close the reader object
```
如果在某些情况下无法手动关闭 PdfReader 对象,可以考虑使用 try-with-resources 语句自动关闭。例如:
```
try (PdfReader reader = new PdfReader("path/to/your/pdf")) {
// do something with reader
} catch (IOException e) {
// handle exception
}
```
这样在 try 块结束时,会自动调用 reader.close() 方法关闭对象。
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ValidationError: Invalid options object. Ignore Plugin has been initialized using an options object that does not match the API schema.
根据引用和引用,"ValidationError: Invalid options object. Ignore Plugin has been initialized using an options object that does not match the API schema."是一个错误信息,意味着Ignore Plugin使用了一个与API架构不匹配的选项对象。根据引用中给出的提示,正确的选项对象应该包含'resourceRegExp'属性(一个正则表达式用于测试请求)或者'checkResource'属性(一个用于过滤资源和上下文的函数)。在错误信息中,'resourceRegExp'属性缺失,应该是一个正则表达式。因此,要解决这个错误,你需要提供一个合法的选项对象,并确保该对象符合API架构的要求。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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ValidationError: Invalid options object. Dev Server has been initialized using an options object that does not match the API schema.
根据提供的引用内容,"ValidationError: Invalid options object. Dev Server has been initialized using an options object that does not match the API schema." 错误是由于使用了不匹配API模式的选项对象导致的。具体而言,错误信息中指出了选项对象中存在一个未知属性'disableHostCheck',而这些有效的属性为:allowedHosts,bonjour,client,compress,devMiddleware,headers,historyApiFallback,host,hot,http2,https,ipc,liveReload,magicHtml,onAfterSetupMiddleware,onBeforeSetupMiddleware,onListening,open,port,proxy,server,setupExitSignals,setupMiddlewares,static,watchFiles和webSocketServer。
为了解决这个问题,您可以检查您的选项对象,并确保只使用了有效的属性。错误信息中提到的'disableHostCheck'属性可能是无效的,您可以尝试将其从选项对象中删除。另外,还可以参考文档或搜索