当我尝试下面的行时，我得到下面的错误。
VerifierBuilder vBuilder = VerifierBuilderFactory.newVerifierBuilder();
Verifier verifier = vBuilder.newVerifier();
Reader reader = new InputStreamReader(multipartExcel.getInputStream());
DecisionTableConfiguration dtconf = KnowledgeBuilderFactory.newDecisionTableConfiguration();
dtconf.setInputType(DecisionTableInputType.XLS);
verifier.addResourcesToVerify(ResourceFactory.newReaderResource(reader), ResourceType.DTABLE, dtconf);
相同的代码在我的windows pc上运行良好。但是当我作为docker部署到linux vm中时，我得到了这个错误。我尝试了在两个服务器上收到的文件大小，它是相同的。
equest processing failed; nested exception is org.drools.template.parser.DecisionTableParseException: Failed to open Excel stream, please check that the content is xls97 format.] with root cause
java.io.IOException: Your InputStream was neither an OLE2 stream, nor an OOXML stream
at org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:258) ~[poi-4.1.2.jar:4.1.2]
at org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:221) ~[poi-4.1.2.jar:4.1.2]
at org.drools.decisiontable.parser.xls.ExcelParser.parseFile(ExcelParser.java:101) ~[drools-decisiontables-7.46.0.Final.jar:7.46.0.Final]
at org.drools.decisiontable.SpreadsheetCompiler.parseResource(SpreadsheetCompiler.java:136) ~[drools-decisiontables-7.46.0.Final.jar:7.46.0.Final]
at org.drools.decisiontable.SpreadsheetCompiler.compile(SpreadsheetCompiler.java:120) ~[drools-decisiontables-7.46.0.Final.jar:7.46.0.Final]
at org.drools.decisiontable.SpreadsheetCompiler.compile(SpreadsheetCompiler.java:93) ~[drools-decisiontables-7.46.0.Final.jar:7.46.0.Final]
at org.drools.decisiontable.DecisionTableProviderImpl.compileResource(DecisionTableProviderImpl.java:74) ~[drools-decisiontables-7.46.0.Final.jar:7.46.0.Final]
at org.drools.decisiontable.DecisionTableProviderImpl.loadFromResource(DecisionTableProviderImpl.java:42) ~[drools-decisiontables-7.46.0.Final.jar:7.46.0.Final]
at org.drools.compiler.compiler.DecisionTableFactory.loadFromResource(DecisionTableFactory.java:35) ~[drools-compiler-7.46.0.Final.jar:7.46.0.Final]
at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.decisionTableToPackageDescr(KnowledgeBuilderImpl.java:412) ~[drools-compiler-7.46.0.Final.jar:7.46.0.Final]
at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.addPackageFromDecisionTable(KnowledgeBuilderImpl.java:381) ~[drools-compiler-7.46.0.Final.jar:7.46.0.Final]
at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.addKnowledgeResource(KnowledgeBuilderImpl.java:749) ~[drools-compiler-7.46.0.Final.jar:7.46.0.Final]
at org.drools.verifier.builder.VerifierPackageBuilder.addKnowledgeResource(VerifierPackageBuilder.java:40) ~[drools-verifier-drl-7.46.0.Final.jar:7.46.0.Final]
at org.drools.verifier.builder.VerifierImpl.addResourcesToVerify(VerifierImpl.java:199) ~[drools-verifier-drl-7.46.0.Final.jar:7.46.0.Final]
at RuleService.validateRule(RuleService.java:272) ~[rule-1.0.0.jar:na]
at RuleService.saveRule(RuleService.java:87) ~[rule-1.0.0.jar:na]
at RuleController.createRule(RuleController.java:70) ~[rule-1.0.0.jar:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
终于解决了。在这里发帖，好像这对别人有帮助似的。
我没有传递reader，而是将multipart保存到一个文件中，并将该文件传递给ResourceFactory。像下面的
verifier.addResourcesToVerify(ResourceFactory.newFileResource(downloadedFile), ruleResourceType, dtconf);