Javaはインターネットに接続できない - java.net.ConnectExceptionの接続は、これは、JPAエンティティのビルド時の強化を自動化するために、私のMavenプロジェクトでOpenJPAの2.4.2を使用している

Question

をタイムアウトになりました：

<plugin> 
    <groupId>org.apache.openjpa</groupId> 
    <artifactId>openjpa-maven-plugin</artifactId> 
    <configuration> 
     <includes>**/entity/*.class</includes> 
     <addDefaultConstructor>true</addDefaultConstructor> 
     <enforcePropertyRestrictions>true</enforcePropertyRestrictions> 
     <persistenceXmlFile>src/main/resources/META-INF/persistence.xml</persistenceXmlFile> 
    </configuration> 
    <executions> 
     <execution> 
      <id>enhancer</id> 
      <phase>process-classes</phase> 
      <goals> 
       <goal>enhance</goal> 
      </goals> 
     </execution> 
    </executions> 
</plugin> 

これは、例外：

java.net.ConnectException: Connection timed out: connect 
at java.net.DualStackPlainSocketImpl.connect0(Native Method) 
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79) 
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) 
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) 
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) 
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) 
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) 
at java.net.Socket.connect(Socket.java:589) 
at java.net.Socket.connect(Socket.java:538) 
at sun.net.NetworkClient.doConnect(NetworkClient.java:180) 
at sun.net.www.http.HttpClient.openServer(HttpClient.java:463) 
at sun.net.www.http.HttpClient.openServer(HttpClient.java:558) 
at sun.net.www.http.HttpClient.<init>(HttpClient.java:242) 
at sun.net.www.http.HttpClient.New(HttpClient.java:339) 
at sun.net.www.http.HttpClient.New(HttpClient.java:357) 
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1202) 
at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1138) 
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1032) 
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:966) 
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1546) 
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474) 
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:647) 
at com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(XMLVersionDetector.java:148) 
at com.sun.org.apache.xerces.internal.impl.xs.opti.SchemaParsingConfig.parse(SchemaParsingConfig.java:582) 
at com.sun.org.apache.xerces.internal.impl.xs.opti.SchemaParsingConfig.parse(SchemaParsingConfig.java:685) 
at com.sun.org.apache.xerces.internal.impl.xs.opti.SchemaDOMParser.parse(SchemaDOMParser.java:530) 
at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.getSchemaDocument(XSDHandler.java:2179) 
at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.parseSchema(XSDHandler.java:576) 
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadSchema(XMLSchemaLoader.java:613) 
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.findSchemaGrammar(XMLSchemaValidator.java:2446) 
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleStartElement(XMLSchemaValidator.java:1767) 
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.startElement(XMLSchemaValidator.java:740) 
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:374) 
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl$NSContentDriver.scanRootElementHook(XMLNSDocumentScannerImpl.java:613) 
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3132) 
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:852) 
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:602) 
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:112) 
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:505) 
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:841) 
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:770) 
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141) 
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213) 
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643) 
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.parse(SAXParserImpl.java:327) 
at org.apache.openjpa.lib.meta.XMLMetaDataParser.parseNewResource(XMLMetaDataParser.java:423) 
at org.apache.openjpa.lib.meta.XMLMetaDataParser.parse(XMLMetaDataParser.java:346) 
at org.apache.openjpa.lib.meta.XMLMetaDataParser.parse(XMLMetaDataParser.java:323) 
at org.apache.openjpa.lib.meta.XMLMetaDataParser.parse(XMLMetaDataParser.java:304) 
at org.apache.openjpa.persistence.PersistenceProductDerivation$ConfigurationParser.parse(PersistenceProductDerivation.java:833) 
at org.apache.openjpa.persistence.PersistenceProductDerivation.load(PersistenceProductDerivation.java:375) 
at org.apache.openjpa.lib.conf.ProductDerivations.load(ProductDerivations.java:310) 
at org.apache.openjpa.lib.conf.ConfigurationImpl.setPropertiesFile(ConfigurationImpl.java:888) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.lang.reflect.Method.invoke(Method.java:498) 
at org.apache.openjpa.lib.util.Options.invoke(Options.java:401) 
at org.apache.openjpa.lib.util.Options.setInto(Options.java:235) 
at org.apache.openjpa.lib.util.Options.setInto(Options.java:191) 
at org.apache.openjpa.lib.conf.Configurations.populateConfiguration(Configurations.java:369) 
at org.apache.openjpa.enhance.PCEnhancer.run(PCEnhancer.java:4833) 
at org.apache.openjpa.enhance.PCEnhancer$1.run(PCEnhancer.java:4804) 
at org.apache.openjpa.lib.conf.Configurations.launchRunnable(Configurations.java:764) 
at org.apache.openjpa.lib.conf.Configurations.runAgainstAllAnchors(Configurations.java:749) 
at org.apache.openjpa.enhance.PCEnhancer.run(PCEnhancer.java:4799) 
at org.apache.openjpa.tools.maven.AbstractOpenJpaEnhancerMojo.enhance(AbstractOpenJpaEnhancerMojo.java:131) 
at org.apache.openjpa.tools.maven.AbstractOpenJpaEnhancerMojo.execute(AbstractOpenJpaEnhancerMojo.java:93) 
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134) 
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207) 
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153) 
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145) 
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116) 
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80) 
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51) 
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128) 
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307) 
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193) 
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106) 
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863) 
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288) 
at org.apache.maven.cli.MavenCli.main(MavenCli.java:199) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.lang.reflect.Method.invoke(Method.java:498) 
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289) 
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229) 
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415) 
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356) 
at org.codehaus.classworlds.Launcher.main(Launcher.java:47) 

例外上記のJavaによって飲み込まれ、それが、この代わりに吐く：

Cannot find the declaration of element 'persistence' 

OpenJPAのエンハンサーがpersistence.xmlとJava 1.8のXercesを開き、XML処理がネットからhttp://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsdを取得しようとしています。

find - grrrrに行くために少しデバッグしました。

私が働いている企業のDNSが見つかりました。 XSDファイルはFirefox（Firefox）やIE（Internet Explorer）で入手できますが、curlを使用した場合、接続に失敗して不正なIPが発生しています。

どのようにいずれかを実行できます。

の（a）（b）は、ローカルファイルから

おかげ

Answer 1

をXSDを取得するには、JavaやMavenを指示するXSDファイルのIPアドレスを発見したり 結局、schemaLocationでローカルファイルを指定するのは非常に簡単でしたが、persistence.xmlファイルを一貫してtarget/classes/META_INFのビルドディレクトリにコピーしていないIntelliJがより不満を募らせました。

は、これは私のpersistence.xmlローカライズされています。

私は片道ローカルXSDファイルを含めることで、問題を解決しますが

<?xml version="1.0" encoding="UTF-8" ?> 
<persistence version="2.1" 
     xmlns="http://xmlns.jcp.org/xml/ns/persistence" 
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
     xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence 
      persistence_2_1.xsd"> 
    <persistence-unit name="default"> 
     <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider> 
     <class>com.xyz.entity.MyEntity</class> 
    </persistence-unit> 
</persistence>