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我试图为 Sonarqube 生成 Jacoco 报告。生成文件 jacoco.exec 有效,但在 Eclipse 的 EclEmma 中将它用于 Sonarqube OR 会导致 EOFException(因此两个实现都很糟糕,或者生成的文件是问题所在)。关于这个问题有一些问题但没有解决方案(除了不使用测试覆盖率)。
我创建了一个 Spring Boot 应用程序并尝试使用 Maven 生成 Jacoco 测试覆盖率报告。使用mvn test
没有问题并在目标文件夹中生成 jacoco.exec 。但是当我尝试使用 mvn sonar:sonar
将结果上传到 Sonarqube 时我总是收到这个错误:
[ERROR] Failed to execute goal org.sonarsource.scanner.maven:sonar-maven-plugin:3.7.0.1746:sonar (default-cli) on project project-name: Unable to read XXX\project-name\target\jacoco.exec: EOFException -> [Help 1]
<build>
...
<plugins>
...
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.8.5</version>
<executions>
<execution>
<id>default-prepare-agent</id>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>default-report</id>
<phase>prepare-package</phase>
<goals>
<goal>report</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
$ mvn sonar:sonar -Dsonar.projectKey=... -Dsonar.host.url=... -Dsonar.login=... -eX
[INFO] Error stacktraces are turned on.
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Detecting the operating system and CPU architecture
[INFO] ------------------------------------------------------------------------
[INFO] os.detected.name: windows
[INFO] os.detected.arch: x86_64
[INFO] os.detected.version: 6.1
[INFO] os.detected.version.major: 6
[INFO] os.detected.version.minor: 1
[INFO] os.detected.classifier: windows-x86_64
[WARNING] The POM for org.eclipse.m2e:lifecycle-mapping:jar:1.0.0 is missing, no dependency information available
[WARNING] Failed to retrieve plugin descriptor for org.eclipse.m2e:lifecycle-mapping:1.0.0: Plugin org.eclipse.m2e:lifecycle-mapping:1.0.0 or one of its dependencies could not be resolved: Failure to find org.eclipse.m2e:lifecycle-mapping:jar:1.0.0 in NEXUS-URL/nexus/content/groups/public was cached in the local repository, resolution will not be reattempted until the update interval of corporate has elapsed or updates are forced
[INFO]
[INFO] --------------< project-name >--------------
[INFO] Building project-name 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[WARNING] The POM for org.eclipse.m2e:lifecycle-mapping:jar:1.0.0 is missing, no dependency information available
[WARNING] Failed to retrieve plugin descriptor for org.eclipse.m2e:lifecycle-mapping:1.0.0: Plugin org.eclipse.m2e:lifecycle-mapping:1.0.0 or one of its dependencies could not be resolved: Failure to find org.eclipse.m2e:lifecycle-mapping:jar:1.0.0 in NEXUS-URL/nexus/content/groups/public was cached in the local repository, resolution will not be reattempted until the update interval of corporate has elapsed or updates are forced
[INFO]
[INFO] --- sonar-maven-plugin:3.7.0.1746:sonar (default-cli) @ project-name ---
[INFO] User cache: C:\Entwicklung\.sonar\cache
[INFO] SonarQube version: 8.0.0
[INFO] Default locale: "de_DE", source code encoding: "UTF-8"
[WARNING] SonarScanner will require Java 11+ to run starting in SonarQube 8.x
[INFO] Load global settings
[INFO] Load global settings (done) | time=85ms
[INFO] Server id: BF41A1F2-AW34YlpIvdDiua-FIR0_
[INFO] User cache: C:\Entwicklung\.sonar\cache
[INFO] Load/download plugins
[INFO] Load plugins index
[INFO] Load plugins index (done) | time=53ms
[INFO] Load/download plugins (done) | time=96ms
[INFO] Process project properties
[INFO] Process project properties (done) | time=13ms
[INFO] Execute project builders
[INFO] Execute project builders (done) | time=4ms
[INFO] Project key: project-name
[INFO] Base dir: XXX\project-name
[INFO] Working dir: XXX\project-name\target\sonar
[INFO] Load project settings for component key: 'project-name'
[INFO] Load project settings for component key: 'project-name' (done) | time=19ms
[INFO] Load quality profiles
[INFO] Load quality profiles (done) | time=275ms
[INFO] Load active rules
[INFO] Load active rules (done) | time=2214ms
[INFO] Indexing files...
[INFO] Project configuration:
[INFO] 25 files indexed
[INFO] 0 files ignored because of scm ignore settings
[INFO] Quality profile for java: Sonar way
[INFO] Quality profile for xml: Sonar way
[INFO] ------------- Run sensors on module project-name
[INFO] Load metrics repository
[INFO] Load metrics repository (done) | time=60ms
[INFO] Sensor JavaSquidSensor [java]
[INFO] Configured Java source version (sonar.java.source): 8
[INFO] JavaClasspath initialization
[INFO] JavaClasspath initialization (done) | time=31ms
[INFO] JavaTestClasspath initialization
[INFO] JavaTestClasspath initialization (done) | time=23ms
[INFO] Java Main Files AST scan
[INFO] 23 source files to be analyzed
[INFO] Load project repositories
[INFO] Load project repositories (done) | time=21ms
[INFO] Java Main Files AST scan (done) | time=4614ms
[INFO] Java Test Files AST scan
[INFO] 1 source files to be analyzed
[INFO] 23/23 source files have been analyzed
[INFO] 1/1 source files have been analyzed
[INFO] Java Test Files AST scan (done) | time=1484ms
[INFO] Sensor JavaSquidSensor [java] (done) | time=7085ms
[INFO] Sensor JaCoCo XML Report Importer [jacoco]
[INFO] Sensor JaCoCo XML Report Importer [jacoco] (done) | time=4ms
[INFO] Sensor SurefireSensor [java]
[INFO] parsing [XXX\project-name\target\surefire-reports]
[INFO] Sensor SurefireSensor [java] (done) | time=75ms
[INFO] Sensor JaCoCoSensor [java]
[WARNING] Property 'sonar.jacoco.reportPaths' is deprecated (JaCoCo binary format). 'sonar.coverage.jacoco.xmlReportPaths' should be used instead (JaCoCo XML format). Please check that the JaCoCo plugin is installed on your SonarQube Instance.
[INFO] Analysing XXX\project-name\target\jacoco.exec
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Skipping project-name
[INFO] This project has been banned from the build due to previous failures.
[INFO] ------------------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 17.163 s
[INFO] Finished at: 2019-10-24T11:04:54+02:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.sonarsource.scanner.maven:sonar-maven-plugin:3.7.0.1746:sonar (default-cli) on project project-name: Unable to read XXX\project-name\target\jacoco.exec: EOFException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.sonarsource.scanner.maven:sonar-maven-plugin:3.7.0.1746:sonar (default-cli) on project project-name: Unable to read XXX\project-name\target\jacoco.exec
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:215)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
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)
Caused by: org.apache.maven.plugin.MojoExecutionException: Unable to read XXX\project-name\target\jacoco.exec
at org.sonarsource.scanner.maven.bootstrap.ScannerBootstrapper.execute (ScannerBootstrapper.java:67)
at org.sonarsource.scanner.maven.SonarQubeMojo.execute (SonarQubeMojo.java:104)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
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)
Caused by: org.sonar.java.AnalysisException: Unable to read XXX\project-name\target\jacoco.exec
at org.sonar.plugins.jacoco.JacocoReportReader.readJacocoReport (JacocoReportReader.java:72)
at org.sonar.plugins.jacoco.UnitTestAnalyzer.readExecutionData (UnitTestAnalyzer.java:129)
at org.sonar.plugins.jacoco.UnitTestAnalyzer.analyse (UnitTestAnalyzer.java:102)
at org.sonar.plugins.jacoco.JaCoCoSensor.execute (JaCoCoSensor.java:94)
at org.sonar.scanner.sensor.AbstractSensorWrapper.analyse (AbstractSensorWrapper.java:48)
at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute (ModuleSensorsExecutor.java:85)
at org.sonar.scanner.sensor.ModuleSensorsExecutor.lambda$execute$1 (ModuleSensorsExecutor.java:59)
at org.sonar.scanner.sensor.ModuleSensorsExecutor.withModuleStrategy (ModuleSensorsExecutor.java:77)
at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute (ModuleSensorsExecutor.java:59)
at org.sonar.scanner.scan.ModuleScanContainer.doAfterStart (ModuleScanContainer.java:82)
at org.sonar.core.platform.ComponentContainer.startComponents (ComponentContainer.java:136)
at org.sonar.core.platform.ComponentContainer.execute (ComponentContainer.java:122)
at org.sonar.scanner.scan.ProjectScanContainer.scan (ProjectScanContainer.java:387)
at org.sonar.scanner.scan.ProjectScanContainer.scanRecursively (ProjectScanContainer.java:383)
at org.sonar.scanner.scan.ProjectScanContainer.doAfterStart (ProjectScanContainer.java:346)
at org.sonar.core.platform.ComponentContainer.startComponents (ComponentContainer.java:136)
at org.sonar.core.platform.ComponentContainer.execute (ComponentContainer.java:122)
at org.sonar.scanner.bootstrap.GlobalContainer.doAfterStart (GlobalContainer.java:141)
at org.sonar.core.platform.ComponentContainer.startComponents (ComponentContainer.java:136)
at org.sonar.core.platform.ComponentContainer.execute (ComponentContainer.java:122)
at org.sonar.batch.bootstrapper.Batch.doExecute (Batch.java:72)
at org.sonar.batch.bootstrapper.Batch.execute (Batch.java:66)
at org.sonarsource.scanner.api.internal.batch.BatchIsolatedLauncher.execute (BatchIsolatedLauncher.java:46)
at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:498)
at org.sonarsource.scanner.api.internal.IsolatedLauncherProxy.invoke (IsolatedLauncherProxy.java:60)
at com.sun.proxy.$Proxy24.execute (Unknown Source)
at org.sonarsource.scanner.api.EmbeddedScanner.doExecute (EmbeddedScanner.java:189)
at org.sonarsource.scanner.api.EmbeddedScanner.execute (EmbeddedScanner.java:138)
at org.sonarsource.scanner.maven.bootstrap.ScannerBootstrapper.execute (ScannerBootstrapper.java:65)
at org.sonarsource.scanner.maven.SonarQubeMojo.execute (SonarQubeMojo.java:104)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
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)
Caused by: java.io.EOFException
at java.io.DataInputStream.readByte (DataInputStream.java:267)
at org.jacoco.core.internal.data.CompactDataInput.readBooleanArray (CompactDataInput.java:63)
at org.jacoco.core.data.ExecutionDataReader.readExecutionData (ExecutionDataReader.java:149)
at org.jacoco.core.data.ExecutionDataReader.readBlock (ExecutionDataReader.java:115)
at org.jacoco.core.data.ExecutionDataReader.read (ExecutionDataReader.java:92)
at org.sonar.plugins.jacoco.JacocoReportReader.readJacocoReport (JacocoReportReader.java:70)
at org.sonar.plugins.jacoco.UnitTestAnalyzer.readExecutionData (UnitTestAnalyzer.java:129)
at org.sonar.plugins.jacoco.UnitTestAnalyzer.analyse (UnitTestAnalyzer.java:102)
at org.sonar.plugins.jacoco.JaCoCoSensor.execute (JaCoCoSensor.java:94)
at org.sonar.scanner.sensor.AbstractSensorWrapper.analyse (AbstractSensorWrapper.java:48)
at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute (ModuleSensorsExecutor.java:85)
at org.sonar.scanner.sensor.ModuleSensorsExecutor.lambda$execute$1 (ModuleSensorsExecutor.java:59)
at org.sonar.scanner.sensor.ModuleSensorsExecutor.withModuleStrategy (ModuleSensorsExecutor.java:77)
at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute (ModuleSensorsExecutor.java:59)
at org.sonar.scanner.scan.ModuleScanContainer.doAfterStart (ModuleScanContainer.java:82)
at org.sonar.core.platform.ComponentContainer.startComponents (ComponentContainer.java:136)
at org.sonar.core.platform.ComponentContainer.execute (ComponentContainer.java:122)
at org.sonar.scanner.scan.ProjectScanContainer.scan (ProjectScanContainer.java:387)
at org.sonar.scanner.scan.ProjectScanContainer.scanRecursively (ProjectScanContainer.java:383)
at org.sonar.scanner.scan.ProjectScanContainer.doAfterStart (ProjectScanContainer.java:346)
at org.sonar.core.platform.ComponentContainer.startComponents (ComponentContainer.java:136)
at org.sonar.core.platform.ComponentContainer.execute (ComponentContainer.java:122)
at org.sonar.scanner.bootstrap.GlobalContainer.doAfterStart (GlobalContainer.java:141)
at org.sonar.core.platform.ComponentContainer.startComponents (ComponentContainer.java:136)
at org.sonar.core.platform.ComponentContainer.execute (ComponentContainer.java:122)
at org.sonar.batch.bootstrapper.Batch.doExecute (Batch.java:72)
at org.sonar.batch.bootstrapper.Batch.execute (Batch.java:66)
at org.sonarsource.scanner.api.internal.batch.BatchIsolatedLauncher.execute (BatchIsolatedLauncher.java:46)
at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:498)
at org.sonarsource.scanner.api.internal.IsolatedLauncherProxy.invoke (IsolatedLauncherProxy.java:60)
at com.sun.proxy.$Proxy24.execute (Unknown Source)
at org.sonarsource.scanner.api.EmbeddedScanner.doExecute (EmbeddedScanner.java:189)
at org.sonarsource.scanner.api.EmbeddedScanner.execute (EmbeddedScanner.java:138)
at org.sonarsource.scanner.maven.bootstrap.ScannerBootstrapper.execute (ScannerBootstrapper.java:65)
at org.sonarsource.scanner.maven.SonarQubeMojo.execute (SonarQubeMojo.java:104)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
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)
[ERROR]
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
最佳答案
根据以下 GitHub 回答 https://github.com/jacoco/jacoco/issues/980#issuecomment-563091107
由于 JVM 关闭未正常执行,exec 二进制文件被截断,这意味着 JaCoCO exec 二进制文件已损坏。
要解决此异常,请确保正常关闭 JVM,即通过调用 JVM 关闭 Hook 。
关于java - Jacoco exec 文件总是出现 EOFException,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/58538294/
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我想在 GUI 上添加延迟。我放置了 2 个 for 循环,然后重新绘制了一个标签,但这 2 个 for 循环一个接一个地执行,并且标签被重新绘制到最后一个。 我能做什么? for(int i=0;
我正在对对象 Student 的列表项进行一些测试,但是我更喜欢在 java 类对象中创建硬编码列表,然后从那里提取数据,而不是连接到数据库并在结果集中选择记录。然而,自从我这样做以来已经很长时间了,
我知道对象创建分为三个部分: 声明 实例化 初始化 classA{} classB extends classA{} classA obj = new classB(1,1); 实例化 它必须使用
我有兴趣使用 GPRS 构建车辆跟踪系统。但是,我有一些问题要问以前做过此操作的人: GPRS 是最好的技术吗?人们意识到任何问题吗? 我计划使用 Java/Java EE - 有更好的技术吗? 如果
我可以通过递归方法反转数组,例如:数组={1,2,3,4,5} 数组结果={5,4,3,2,1}但我的结果是相同的数组,我不知道为什么,请帮助我。 public class Recursion { p
有这样的标准方式吗? 包括 Java源代码-测试代码- Ant 或 Maven联合单元持续集成(可能是巡航控制)ClearCase 版本控制工具部署到应用服务器 最后我希望有一个自动构建和集成环境。
我什至不知道这是否可能,我非常怀疑它是否可能,但如果可以,您能告诉我怎么做吗?我只是想知道如何从打印机打印一些文本。 有什么想法吗? 最佳答案 这里有更简单的事情。 import javax.swin
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