MyBatis报错 ：Failed to read external DTD 'mybatis-3-config.dtd'... http ... accessExternalDTD...
当前我的解决方式是在MyBatis源码基础上，因为需要修改一点点源码，如果不是使用源码则另寻它法。报错如图所示：
java.lang.ExceptionInInitializerError at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at org.junit.platform.commons.util.ReflectionUtils.newInstance(ReflectionUtils.java:500) at org.junit.jupiter.engine.execution.ConstructorInvocation.proceed(ConstructorInvocation.java:56) at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:125) at org.junit.jupiter.api.extension.InvocationInterceptor.interceptTestClassConstructor(InvocationInterceptor.java:69) at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105) at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:104) at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:62) at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:43) at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:35) at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104) at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:77) at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.invokeTestClassConstructor(ClassBasedTestDescriptor.java:329) at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.instantiateTestClass(ClassBasedTestDescriptor.java:276) at org.junit.jupiter.engine.descriptor.ClassTestDescriptor.instantiateTestClass(ClassTestDescriptor.java:77) at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.instantiateAndPostProcessTestInstance(ClassBasedTestDescriptor.java:258) at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$2(ClassBasedTestDescriptor.java:252) at java.util.Optional.orElseGet(Optional.java:267) at org.junit.jupiter.engine.descriptor.ClassBasedTestDescriptor.lambda$testInstancesProvider$3(ClassBasedTestDescriptor.java:251) at org.junit.jupiter.engine.execution.TestInstancesProvider.getTestInstances(TestInstancesProvider.java:29) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$prepare$0(TestMethodTestDescriptor.java:106) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:105) at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.prepare(TestMethodTestDescriptor.java:69) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$prepare$1(NodeTestTask.java:107) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.prepare(NodeTestTask.java:107) at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:75) at java.util.ArrayList.forEach(ArrayList.java:1257) at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125) at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122) at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80) at java.util.ArrayList.forEach(ArrayList.java:1257) at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:125) at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:135) at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:123) at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73) at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:122) at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:80) at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32) at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57) at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:229) at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$6(DefaultLauncher.java:197) at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:211) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:191) at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:128) at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:69) at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70) Caused by: org.apache.ibatis.exceptions.PersistenceException: ### Error building SqlSession. ### Cause: org.apache.ibatis.builder.BuilderException: Error creating document instance. Cause: org.xml.sax.SAXParseException; lineNumber: 3; columnNumber: 26; External DTD: Failed to read external DTD 'mybatis-3-config.dtd', because 'file' access is not allowed due to restriction set by the accessExternalDTD property. at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30) at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:80) at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:64) at wy.hanyufang.cn.mybatis.MyBatisApplication.<clinit>(MyBatisApplication.java:34) ... 63 more Caused by: org.apache.ibatis.builder.BuilderException: Error creating document instance. Cause: org.xml.sax.SAXParseException; lineNumber: 3; columnNumber: 26; External DTD: Failed to read external DTD 'mybatis-3-config.dtd', because 'file' access is not allowed due to restriction set by the accessExternalDTD property. at org.apache.ibatis.parsing.XPathParser.createDocument(XPathParser.java:263) at org.apache.ibatis.parsing.XPathParser.<init>(XPathParser.java:127) at org.apache.ibatis.builder.xml.XMLConfigBuilder.<init>(XMLConfigBuilder.java:82) at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:77) ... 65 more Caused by: org.xml.sax.SAXParseException; lineNumber: 3; columnNumber: 26; External DTD: Failed to read external DTD 'mybatis-3-config.dtd', because 'file' access is not allowed due to restriction set by the accessExternalDTD property. at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:203) at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:177) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:400) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:327) at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1472) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(XMLDocumentScannerImpl.java:1157) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(XMLDocumentScannerImpl.java:1045) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:959) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:602) 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:842) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:771) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141) at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:243) at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:339) at org.apache.ibatis.parsing.XPathParser.createDocument(XPathParser.java:261) ... 68 more
1.方法一：（你可能会使用到的解决方法：https://blog.csdn.net/dingshuo168/article/details/103317453 ）
2. 最简单的方式，修改应用启动类的JVM，添加启动参数：缺点是如果使用Spring的@Test进行测试的，那么每次调用都要重新添加，非常烦～
-Djavax.xml.accessExternalDTD=all
3.直接修改源码，通过调试可以找到程序报错的位置（详细步骤就不写了...）
· myBatis配置加载和运行位置：
@RunWith(SpringRunner.class) class MyBatisApplication { private static SqlSessionFactoryBuilder factoryBuilder; private static SqlSessionFactory sqlSessionFactory; private static Transaction transaction; private static Connection connection; static{ //获取配置文件 factoryBuilder = new SqlSessionFactoryBuilder(); sqlSessionFactory = factoryBuilder.build(HanServerApplication.class.getClassLoader() .getResourceAsStream("mybatis-config.xml")); Environment environment = sqlSessionFactory.getConfiguration().getEnvironment(); try { connection= environment.getDataSource().getConnection(); } catch (SQLException e) { e.printStackTrace(); } transaction = new JdbcTransaction(connection); }
//程序调用位置 @Test void test1() throws Exception{ SimpleExecutor simpleExecutor = new SimpleExecutor(sqlSessionFactory.getConfiguration(),transaction); MappedStatement mapper = sqlSessionFactory.getConfiguration() .getMappedStatement("wy.hanyufang.cn.mybatis.dao.testMapper.selectByPrimaryKey"); List<Object> objects = simpleExecutor.doQuery(mapper, 5075937, RowBounds.DEFAULT, SimpleExecutor.NO_RESULT_HANDLER, mapper.getBoundSql(5075937)); System.out.println(JSON.toJSONString(objects)); } }
· 程序异常位置以及修改的位置（标红）：
解决办法就是：无论是读取 ...config.dtd 文件、还是读取 ...apper.dtd文件，都让它去读取项目resurce文件夹下的资源文件。
如下所示：
1.需要将 mybatis-3-config.dtd、mybatis-3-mapper.dtd 两个文件放到resource资源目录下。
http://mybatis.org/dtd/mybatis-3-config.dtd
http://mybatis.org/dtd/mybatis-3-mapper.dtd
如图：
2.我添加了两行代码，并且修改了 if 判断：
private static final String MYBATIS_CONFIG_SYSTEM_local = "config/mybatis-3-config.dtd";
private static final String MYBATIS_MAPPER_SYSTEM_local = "config/mybatis-3-mapper.dtd";
如果需要读取 config.dtd 则让它去 MYBATIS_CONFIG_SYSTEM_local 路径下读取。
如果需要读取 mapper.dtd 则让它去 MYBATIS_MAPPER_SYSTEM_local 路径下读取。
package org.apache.ibatis.builder.xml;
import java.io.IOException;
import java.io.InputStream;
import java.util.Locale;
import org.apache.ibatis.io.Resources;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
/**
* Offline entity resolver for the MyBatis DTDs.
*
* @author Clinton Begin
* @author Eduardo Macarron
*/
public class XMLMapperEntityResolver implements EntityResolver {
private static final String IBATIS_CONFIG_SYSTEM = "ibatis-3-config.dtd";
private static final String IBATIS_MAPPER_SYSTEM = "ibatis-3-mapper.dtd";
private static final String MYBATIS_CONFIG_SYSTEM = "mybatis-3-config.dtd";
private static final String MYBATIS_CONFIG_SYSTEM_local = "config/mybatis-3-config.dtd";
private static final String MYBATIS_MAPPER_SYSTEM_local = "config/mybatis-3-mapper.dtd";
private static final String MYBATIS_MAPPER_SYSTEM = "mybatis-3-mapper.dtd";
private static final String MYBATIS_CONFIG_DTD = "org/apache/ibatis/builder/xml/mybatis-3-config.dtd";
private static final String MYBATIS_MAPPER_DTD = "org/apache/ibatis/builder/xml/mybatis-3-mapper.dtd";
/**
* Converts a public DTD into a local one.
*
* @param publicId
* The public id that is what comes after "PUBLIC"
* @param systemId
* The system id that is what comes after the public id.
* @return The InputSource for the DTD
*
* @throws org.xml.sax.SAXException
* If anything goes wrong
*/
@Override
public InputSource resolveEntity(String publicId, String systemId) throws SAXException {
try {
if (systemId != null) {
String lowerCaseSystemId = systemId.toLowerCase(Locale.ENGLISH);
if (lowerCaseSystemId.contains(MYBATIS_CONFIG_SYSTEM) || lowerCaseSystemId.contains(IBATIS_CONFIG_SYSTEM)) {
return getInputSource(MYBATIS_CONFIG_SYSTEM_local, publicId, systemId);
} else if (lowerCaseSystemId.contains(MYBATIS_MAPPER_SYSTEM) || lowerCaseSystemId.contains(IBATIS_MAPPER_SYSTEM)) {
return getInputSource(MYBATIS_MAPPER_SYSTEM_local, publicId, systemId);
}
}
return null;
} catch (Exception e) {
throw new SAXException(e.toString());
}
}
private InputSource getInputSource(String path, String publicId, String systemId) {
InputSource source = null;
if (path != null) {
try {
InputStream in = Resources.getResourceAsStream(path);
source = new InputSource(in);
source.setPublicId(publicId);
source.setSystemId(systemId);
} catch (IOException e) {
// ignore, null is ok
}
}
return source;
}
}
3.修改后重新测试，完成，返回结果
Connected to the target VM, address: '127.0.0.1:51594', transport: 'socket' 11:58:29.803 [main] DEBUG org.apache.ibatis.logging.LogFactory - Logging initialized using 'class org.apache.ibatis.logging.slf4j.Slf4jImpl' adapter. 11:58:29.840 [main] DEBUG org.apache.ibatis.datasource.pooled.PooledDataSource - PooledDataSource forcefully closed/removed all connections. 11:58:29.840 [main] DEBUG org.apache.ibatis.datasource.pooled.PooledDataSource - PooledDataSource forcefully closed/removed all connections. 11:58:29.840 [main] DEBUG org.apache.ibatis.datasource.pooled.PooledDataSource - PooledDataSource forcefully closed/removed all connections. 11:58:29.840 [main] DEBUG org.apache.ibatis.datasource.pooled.PooledDataSource - PooledDataSource forcefully closed/removed all connections. 11:58:33.785 [main] DEBUG org.apache.ibatis.datasource.pooled.PooledDataSource - Created connection 688593710. 11:58:33.826 [main] DEBUG wy.hanyufang.cn.mybatis.dao.testMapper.selectByPrimaryKey - ==> Preparing: select id, title, author from test where id = ? 11:58:33.887 [main] DEBUG wy.hanyufang.cn.mybatis.dao.testMapper.selectByPrimaryKey - ==> Parameters: 5075937(Integer) 11:58:33.934 [main] DEBUG wy.hanyufang.cn.mybatis.dao.testMapper.selectByPrimaryKey - <== Total: 1 [{"author":"用户：3","id":5075937,"title":"hello world:2"}]
