class.getResource从测试资源返回null

Question

我有一个包含以下函数的Utils.scala类：

object Utils {
    def getQueryFromFile(fileName: String): String = {
        if (fileName != null) {
            try {
                val path = getClass.getResourceAsStream(s"/$fileName.sql")
                Source.fromInputStream(path).getLines.mkString
            }
            catch {
                case _: NullPointerException => throw new FileNotFoundException(s"queryDefinition: $fileName Does not exist")
            }
        }
        else {
            throw new InvalidFileInputException(s"FileInput.read: file name is null")
        }
    }
}

我在src/main/resources中的文件中有两个sql查询。当我从包含main()方法的Object (从src/main/scala)运行这个方法时，它工作得很好，但是当我试图通过测试用例(ScalaTest)运行它时，它失败了。它抛出了这个错误：

queryDefinition: a.sql Does not exist
java.io.FileNotFoundException: queryDefinition: COUNT_CHECK.sql Does not exist
    at com.eventdetector.utils.Utils$.getQueryFromFile(Utils.scala:19)
    at com.eventdetector.budget.BudgetCheckTest$$anonfun$5.apply(BudgetCheckTest.scala:47)

这个文件肯定存在于src/main/resources中。然后我想，既然我正在运行src/test/scala目录中的测试用例文件，我也尝试将该文件放在src/test/resources中，但这也没有帮助。

编辑:如果有帮助，我的pom.xml看起来像这样：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.eventdetector</groupId>
    <artifactId>EventDetector</artifactId>
    <version>0.1</version>
    <name>${project.artifactId}</name>
    <inceptionYear>2020</inceptionYear>

    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <encoding>UTF-8</encoding>
        <scala.version>2.11.12</scala.version>
        <scala.compat.version>2.11</scala.compat.version>
        <spark.version>2.4.4</spark.version>
        <spec2.version>4.2.0</spec2.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.scala-lang</groupId>
            <artifactId>scala-library</artifactId>
            <version>${scala.version}</version>
        </dependency>
        <dependency>
            <groupId>com.ibm.db2.jcc</groupId>
            <artifactId>db2jcc</artifactId>
            <version>db2jcc4</version>
        </dependency>
        <dependency>
            <groupId>org.scalaj</groupId>
            <artifactId>scalaj-http_${scala.compat.version}</artifactId>
            <version>2.4.2</version>
        </dependency>
        <dependency>
            <groupId>com.typesafe.play</groupId>
            <artifactId>play-json_${scala.compat.version}</artifactId>
            <version>2.7.3</version>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.scalikejdbc</groupId>
            <artifactId>scalikejdbc_${scala.compat.version}</artifactId>
            <version>3.4.1</version>
        </dependency>
        <!-- Test -->
        <dependency>
            <groupId>org.scalatest</groupId>
            <artifactId>scalatest_${scala.compat.version}</artifactId>
            <version>3.0.5</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <sourceDirectory>src/main/scala</sourceDirectory>
        <testSourceDirectory>src/test/scala</testSourceDirectory>
        <resources>
            <resource>
                <directory>src/main/scala</directory>
                <includes>
                    <include>**/*.sql</include>
                </includes>
                <filtering>true</filtering>
            </resource>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.sql</include>
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <!-- see http://davidb.github.com/scala-maven-plugin -->
                <groupId>net.alchim31.maven</groupId>
                <artifactId>scala-maven-plugin</artifactId>
                <version>3.3.2</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>compile</goal>
                            <goal>testCompile</goal>
                        </goals>
                        <configuration>
                            <args>
                                <arg>-dependencyfile</arg>
                                <arg>${project.build.directory}/.scala_dependencies</arg>
                            </args>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.21.0</version>
                <configuration>
                    <!-- Tests will be run with scalatest-maven-plugin instead -->
                    <skipTests>true</skipTests>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.scalatest</groupId>
                <artifactId>scalatest-maven-plugin</artifactId>
                <version>2.0.0</version>
                <configuration>
                    <reportsDirectory>${project.build.directory}/surefire-reports</reportsDirectory>
                    <junitxml>.</junitxml>
                    <filereports>TestSuiteReport.txt</filereports>
                    <!-- Comma separated list of JUnit test class names to execute -->
                    <jUnitClasses>samples.AppTest</jUnitClasses>
                </configuration>
                <executions>
                    <execution>
                        <id>test</id>
                        <goals>
                            <goal>test</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

Answer 1

在使用maven约定时，您可以使用explicitly overriden it in POM来使用不同的资源目录。

        <resources>
            <resource>
                <directory>src/main/scala</directory>
                <includes>
                    <include>**/*.sql</include>
                </includes>
                <filtering>true</filtering>
            </resource>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.sql</include>
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>

因此，要么删除该部分，要么将其修复为使用src/main/resources。

Answer 2

尝试将资源src/main/resources添加到pom.xml中的资源块：

<resource>
    <directory>src/main/resources</directory>
    <includes>
        <include>*.sql</include>
    </includes>
    <filtering>true</filtering>
</resource>

在您的pom.xml中，资源应该放在src/main/scala和src/main/java中，但通常这些目录是用来存放代码的，而不是存放某些资源文件的。默认情况下，资源放在src/main/resources中。不要忘记在测试之前调用maven clean。