我有一些 PDF 文件，直到几天前我才使用tika.
我没有更改我的代码中的任何内容，但我不再能够通过运行以下代码查看相同 PDF 中的内容：
from tika import parser
raw = parser.from_file('reits.pdf', 'http://localhost:9998/tika')
print(raw['content'])
直到最近，这在最新安装的 tika 上运行良好conda install -c conda-forge tika
问题似乎是Java没有激活。当我查看时出现以下错误metadata
'X-TIKA:EXCEPTION:runtime': 'java.lang.NullPointerException\n\tat
我不确定以下内容是否有帮助，但元数据也返回了：
X-Parsed-By': ['org.apache.tika.parser.DefaultParser','org.apache.tika.parser.pdf.PDFParser']
我该怎么做才能让 tika 重新开始工作？
如果这有帮助：
The full exception stack trace is included below:
org.apache.tika.exception.TikaException: Unexpected RuntimeException from org.apache.tika.parser.pdf.PDFParser@3b75f5cb
at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:293)
at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:280)
at org.apache.tika.parser.AutoDetectParser.parse(AutoDetectParser.java:143)
at org.apache.tika.parser.ParserDecorator.parse(ParserDecorator.java:188)
at org.apache.tika.parser.DigestingParser.parse(DigestingParser.java:84)
at org.apache.tika.gui.TikaGUI.handleStream(TikaGUI.java:358)
at org.apache.tika.gui.TikaGUI.openFile(TikaGUI.java:309)
at org.apache.tika.gui.ParsingTransferHandler.importFiles(ParsingTransferHandler.java:94)
at org.apache.tika.gui.ParsingTransferHandler.importData(ParsingTransferHandler.java:77)
at javax.swing.TransferHandler.importData(TransferHandler.java:827)
at javax.swing.TransferHandler$DropHandler.drop(TransferHandler.java:1544)
at java.awt.dnd.DropTarget.drop(DropTarget.java:455)
at javax.swing.TransferHandler$SwingDropTarget.drop(TransferHandler.java:1282)
at sun.awt.dnd.SunDropTargetContextPeer.processDropMessage(SunDropTargetContextPeer.java:538)
at sun.lwawt.macosx.CDropTargetContextPeer.processDropMessage(CDropTargetContextPeer.java:143)
at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchDropEvent(SunDropTargetContextPeer.java:852)
at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchEvent(SunDropTargetContextPeer.java:776)
at sun.awt.dnd.SunDropTargetEvent.dispatch(SunDropTargetEvent.java:48)
at java.awt.Component.dispatchEventImpl(Component.java:4744)
at java.awt.Container.dispatchEventImpl(Container.java:2297)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4904)
at java.awt.LightweightDispatcher.processDropTargetEvent(Container.java:4609)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4471)
at java.awt.Container.dispatchEventImpl(Container.java:2283)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:760)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:84)
at java.awt.EventQueue$4.run(EventQueue.java:733)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:730)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Caused by: java.lang.NullPointerException
at org.apache.tika.parser.pdf.AbstractPDF2XHTML.extractXMPXFA(AbstractPDF2XHTML.java:209)
at org.apache.tika.parser.pdf.AbstractPDF2XHTML.endDocument(AbstractPDF2XHTML.java:678)
at org.apache.pdfbox.text.PDFTextStripper.writeText(PDFTextStripper.java:267)
at org.apache.tika.parser.pdf.PDF2XHTML.process(PDF2XHTML.java:96)
at org.apache.tika.parser.pdf.PDFParser.parse(PDFParser.java:174)
at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:280)
... 44 more
编辑通过遵循这个答案 ，我能够让 Tika 工作
具体来说，我将目录更改为下载 Tika 服务器文件的位置，然后运行：
java -jar tika-server-x.x.jar -h 0.0.0.0
一旦我在我的 cmd 行中运行上述内容，服务器就启动了，我的代码工作了，我可以查看content.
如何确保 python 中的 Tika 自动打开服务器以避免这种手动解决方法？是否有我需要设置的环境变量？