SonarScanner是如何执行的

本地复现

ERROR: Error during SonarQube Scanner execution
java.lang.IllegalStateException: Can not execute Checkstyle
        at org.sonar.plugins.checkstyle.CheckstyleExecutor.executeWithClassLoader(CheckstyleExecutor.java:110)
        at org.sonar.plugins.checkstyle.CheckstyleExecutor.execute(CheckstyleExecutor.java:78)
        at org.sonar.plugins.checkstyle.CheckstyleSensor.execute(CheckstyleSensor.java:42)
        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:137)
        at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:123)
        at org.sonar.scanner.scan.ProjectScanContainer.scan(ProjectScanContainer.java:388)
        at org.sonar.scanner.scan.ProjectScanContainer.scanRecursively(ProjectScanContainer.java:384)
        at org.sonar.scanner.scan.ProjectScanContainer.doAfterStart(ProjectScanContainer.java:353)
        at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:137)
        at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:123)
        at org.sonar.scanner.bootstrap.GlobalContainer.doAfterStart(GlobalContainer.java:144)
        at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:137)
        at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:123)
        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 java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.base/java.lang.reflect.Method.invoke(Unknown Source)
        at org.sonarsource.scanner.api.internal.IsolatedLauncherProxy.invoke(IsolatedLauncherProxy.java:60)
        at com.sun.proxy.$Proxy0.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.cli.Main.execute(Main.java:112)
        at org.sonarsource.scanner.cli.Main.execute(Main.java:75)
        at org.sonarsource.scanner.cli.Main.main(Main.java:61)
Caused by: com.puppycrawl.tools.checkstyle.api.CheckstyleException: Exception was thrown while processing E:\download\1216\eipis-user\service\src\main\java\com\democom\finance\eipis\user\service\impl\UserServiceImpl.java
        at com.puppycrawl.tools.checkstyle.Checker.processFiles(Checker.java:311)
        at com.puppycrawl.tools.checkstyle.Checker.process(Checker.java:221)
        at org.sonar.plugins.checkstyle.CheckstyleExecutor.executeWithClassLoader(CheckstyleExecutor.java:103)
        ... 32 more
Caused by: com.puppycrawl.tools.checkstyle.api.CheckstyleException: IllegalStateException occurred while parsing file E:\download\1216\eipis-user\service\src\main\java\com\democom\finance\eipis\user\service\impl\UserServiceImpl.java.
        at com.puppycrawl.tools.checkstyle.JavaParser.parse(JavaParser.java:120)
        at com.puppycrawl.tools.checkstyle.TreeWalker.processFiltered(TreeWalker.java:149)
        at com.puppycrawl.tools.checkstyle.api.AbstractFileSetCheck.process(AbstractFileSetCheck.java:87)
        at com.puppycrawl.tools.checkstyle.Checker.processFile(Checker.java:337)
        at com.puppycrawl.tools.checkstyle.Checker.processFiles(Checker.java:298)
        ... 34 more
Caused by: java.lang.IllegalStateException: E:\download\1216\eipis-user\service\src\main\java\com\democom\finance\eipis\user\service\impl\UserServiceImpl.java:790:1: expecting RCURLY, found 'null'
        at com.puppycrawl.tools.checkstyle.JavaParser$1.reportError(JavaParser.java:108)
        at com.puppycrawl.tools.checkstyle.grammar.GeneratedJavaRecognizer.typeDefinition(GeneratedJavaRecognizer.java:424)
        at com.puppycrawl.tools.checkstyle.grammar.GeneratedJavaRecognizer.compilationUnit(GeneratedJavaRecognizer.java:212)
        at com.puppycrawl.tools.checkstyle.JavaParser.parse(JavaParser.java:114)
        ... 38 more
Caused by: E:\download\1216\eipis-user\service\src\main\java\com\democom\finance\eipis\user\service\impl\UserServiceImpl.java:790:1: expecting RCURLY, found 'null'
        at antlr.Parser.match(Parser.java:211)
        at com.puppycrawl.tools.checkstyle.grammar.GeneratedJavaRecognizer.compoundStatement(GeneratedJavaRecognizer.java:4555)
        at com.puppycrawl.tools.checkstyle.grammar.GeneratedJavaRecognizer.field(GeneratedJavaRecognizer.java:3158)
        at com.puppycrawl.tools.checkstyle.grammar.GeneratedJavaRecognizer.classBlock(GeneratedJavaRecognizer.java:3415)
        at com.puppycrawl.tools.checkstyle.grammar.GeneratedJavaRecognizer.classDefinition(GeneratedJavaRecognizer.java:646)
        at com.puppycrawl.tools.checkstyle.grammar.GeneratedJavaRecognizer.typeDefinitionInternal(GeneratedJavaRecognizer.java:561)
        at com.puppycrawl.tools.checkstyle.grammar.GeneratedJavaRecognizer.typeDefinition(GeneratedJavaRecognizer.java:402)
        ... 40 more

默认插件sonar-java中注册了ExternalReportExtensions.define(context);针对三大插件的Sensor——

context.addExtension(CheckstyleSensor.class);
context.addExtension(PmdSensor.class);
context.addExtension(SpotBugsSensor.class);

默认执行阶段是在对文件本地的扫描扫描之后调用执行——

INFO: 26/26 source files have been analyzed
INFO: Sensor SonarCSS Rules [cssfamily] (done) | time=4249ms
INFO: Sensor PmdSensor [pmd]
INFO: Sensor PmdSensor [pmd] (done) | time=0ms
INFO: Sensor EndSensor [javacustom]
INFO: Sensor EndSensor [javacustom] (done) | time=1ms
INFO: Sensor JaCoCo XML Report Importer [jacoco]
WARN: No coverage report can be found with sonar.coverage.jacoco.xmlReportPaths='ut/target/site/jacoco-aggregate/jacoco.xml'. Using default locations: target/site/jacoco/jacoco.xml,target/site/jacoco-it/jacoco.xml,build/reports/jacoco/test/jacocoTestReport.xml
INFO: No report imported, no coverage information will be imported by JaCoCo XML Report Importer
INFO: Sensor JaCoCo XML Report Importer [jacoco] (done) | time=5ms
INFO: Sensor SurefireSensor [java]
INFO: parsing [E:\download\1216\eipis-user\target\surefire-reports]
INFO: Sensor SurefireSensor [java] (done) | time=1ms
INFO: Sensor JavaXmlSensor [java]
INFO: Sensor JavaXmlSensor [java] (done) | time=3ms
INFO: Sensor HTML [web]
INFO: Sensor HTML [web] (done) | time=237ms
INFO: Sensor CheckstyleSensor [checkstyle]
INFO: Checkstyle output report: E:\download\1216\eipis-user\.scannerwork\checkstyle-result.xml
INFO: Checkstyle configuration: E:\download\1216\eipis-user\.scannerwork\checkstyle.xml
INFO: Checkstyle charset: UTF-8
INFO: ------------------------------------------------------------------------
INFO: EXECUTION FAILURE

~~这样还是不能倒推到报错的堆栈信息上啊？-_-|| 看起来还得加上 https://github.com/SonarSource/sonarqube/这里的代码才能梳理出来完整逻辑。先缓缓~~

重新读了一下执行逻辑，不需要sonarqube端的代码。sonar-scanner-cli只是简单做了一个壳，执行的逻辑依赖sonar-scanner-api。跟踪以下调用链路即可，包含了这两个工程的代码。

核心是通过proxy的方式，调用了org.sonarsource.scanner.api.internal.batch.BatchIsolatedLauncher类的execute方法。IsolatedLauncherProxy是代理执行的InvocationHandler

at org.sonarsource.scanner.api.internal.IsolatedLauncherProxy.invoke(IsolatedLauncherProxy.java:60)
at com.sun.proxy.$Proxy0.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.cli.Main.execute(Main.java:112)
at org.sonarsource.scanner.cli.Main.execute(Main.java:75)
at org.sonarsource.scanner.cli.Main.main(Main.java:61)

根据使用scanner执行一次正常的操作，结合log输出更方便理解。sonar-scanner-cli工程就是发布的sonar-scanner工具的源码，只是在发布时，根据不同的平台增加了一个jre的执行环境

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SonarScanner是如何执行的

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