首先让我说我正在学习Java，来自.NET/C#世界。

太长别读：这种语法在VSCode或Eclipse中不起作用IDE在IntelliJ中起作用。为什么？我错过了什么？

    import path.to.class.Foo;
    import path.to.class.Foo_; // cannot be resolved error

...

   Foo_.barID; // cannot resolve to a variable

underscore_符号只是导致上面的错误

长版本：

我在API工作，我的团队是这个项目的新手。我们都不是JAVA特定的开发人员，在过去的几个月里，我们学到了很多东西。最初的开发人员使用IntelliJ创建了这个项目，并使用IDE支持它。不幸的是，我们的IntelliJ许可证一直被允许过期，需要一周时间才能恢复，我不擅长停机，所以我尝试了Eclipse和VSCode。当尝试调试时，项目无法构建，因为一些导入无法解析，以及一些似乎使用JPA 2.0表示法进行动态、类型安全查询的变量。阅读下面的内容，这个符号似乎已经存在了很长时间，而EclipseJavaIDE很长时间，所以我认为我显然遗漏了一些东西。连接到类名的下划线是什么意思？https://developer.ibm.com/articles/j-typesafejpa/#N102F2https://developer.ibm.com/articles/j-typesafejpa/

我很难相信这只在IntelliJ中是可能的，所以它必须是我在IDE中缺少的东西。一个包，或者设置，或者不允许IDE使用标准API的东西？

请求的pom. xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>foo-app</artifactId>
        <groupId>foo.bar.app</groupId>
        <version>0.4.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>bar-api</artifactId>
    <name>Public Facing API</name>

    <properties>
        <mainClass>foo.bar.fib.api.ApiService</mainClass>
        <jjwt.version>0.11.4</jjwt.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>foo.bar.fib</groupId>
            <artifactId>fib-testing</artifactId>
            <version>0.4.0-SNAPSHOT</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>io.dropwizard</groupId>
            <artifactId>dropwizard-core</artifactId>
        </dependency>
        <dependency>
            <groupId>io.dropwizard</groupId>
            <artifactId>dropwizard-client</artifactId>
        </dependency>
        <dependency>
            <groupId>io.dropwizard</groupId>
            <artifactId>dropwizard-migrations</artifactId>
        </dependency>
        <dependency>
            <groupId>io.dropwizard</groupId>
            <artifactId>dropwizard-hibernate</artifactId>
        </dependency>
        <dependency>
            <groupId>io.dropwizard</groupId>
            <artifactId>dropwizard-auth</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
        </dependency>
        <dependency>
            <groupId>com.hubspot.dropwizard</groupId>
            <artifactId>dropwizard-guicier</artifactId>
        </dependency>
        <dependency>
            <groupId>${typesafe.config.groupID}</groupId>
            <artifactId>typesafe-dropwizard-configuration</artifactId>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.11.0</version>
        </dependency>
        <dependency>
            <groupId>foo.bar.fib</groupId>
            <artifactId>fib-queue</artifactId>
            <version>0.4.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>foo.bar.fib</groupId>
            <artifactId>fib-common</artifactId>
            <version>0.4.0-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>foo.bar.fib</groupId>
            <artifactId>fib-tokens</artifactId>
            <version>0.4.0-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>foo.bar.fib</groupId>
            <artifactId>fib-buttonstuff</artifactId>
            <version>0.4.0-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>${hapi.fhir.groupID}</groupId>
            <artifactId>hapi-fhir-client</artifactId>
        </dependency>
        <dependency>
            <groupId>com.jakewharton.fliptables</groupId>
            <artifactId>fliptables</artifactId>
            <version>1.1.0</version>
        </dependency>
        <dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcprov-jdk15on</artifactId>
            <version>${bouncey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcpkix-jdk15on</artifactId>
            <version>${bouncey.version}</version>
        </dependency>
        <dependency>
            <groupId>${hapi.fhir.groupID}</groupId>
            <artifactId>hapi-fhir-structures-r4</artifactId>
        </dependency>
        <dependency>
            <groupId>${hapi.fhir.groupID}</groupId>
            <artifactId>hapi-fhir-validation-resources-dstu3</artifactId>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>com.helger</groupId>
            <artifactId>ph-schematron</artifactId>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt-api</artifactId>
            <version>${jjwt.version}</version>
        </dependency>
        <dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt-impl</artifactId>
            <version>${jjwt.version}</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt-jackson</artifactId>
            <version>${jjwt.version}</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>com.github.ben-manes.caffeine</groupId>
            <artifactId>caffeine</artifactId>
            <version>2.9.3</version>
        </dependency>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
        </dependency>
        <dependency>
            <groupId>com.newrelic.agent.java</groupId>
            <artifactId>newrelic-java</artifactId>
            <version>${newrelic.agent.version}</version>
            <type>${newrelic.agent.type}</type>
        </dependency>
        <dependency>
            <groupId>io.dropwizard</groupId>
            <artifactId>dropwizard-json-logging</artifactId>
        </dependency>
        <!--Test resources-->
        <dependency>
            <groupId>io.dropwizard</groupId>
            <artifactId>dropwizard-testing</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-core</artifactId>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-params</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.test-framework.providers</groupId>
            <artifactId>jersey-test-framework-provider-grizzly2</artifactId>
            <version>2.31</version>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>javax.servlet</groupId>
                    <artifactId>javax.servlet-api</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>junit</groupId>
                    <artifactId>junit</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.9.0</version>
        </dependency>
    </dependencies>

    <build>
        <resources>
            <resource>
                <directory>${project.basedir}/../src/main/resources</directory>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
            </resource>
        </resources>
        <testResources>
            <testResource>
                <directory>${project.basedir}/../src/main/resources</directory>
            </testResource>
            <testResource>
                <directory>src/test/resources</directory>
            </testResource>
        </testResources>
        <plugins>
            <plugin>
                <artifactId>maven-shade-plugin</artifactId>
                <configuration>
                    <createDependencyReducedPom>true</createDependencyReducedPom>
                    <transformers>
                        <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
                        <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                            <mainClass>${mainClass}</mainClass>
                        </transformer>
                    </transformers>
                    <filters>
                        <filter>
                            <artifact>*:*</artifact>
                            <excludes>
                                <exclude>META-INF/*.SF</exclude>
                                <exclude>META-INF/*.DSA</exclude>
                                <exclude>META-INF/*.RSA</exclude>
                            </excludes>
                        </filter>
                    </filters>
                    <shadedArtifactAttached>true</shadedArtifactAttached>
                    <finalName>${project.artifactId}</finalName>
                </configuration>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <artifactId>maven-jar-plugin</artifactId>
                <configuration>
                    <archive>
                        <manifest>
                            <addClasspath>true</addClasspath>
                            <mainClass>${mainClass}</mainClass>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>com.google.cloud.tools</groupId>
                <artifactId>jib-maven-plugin</artifactId>
                <configuration>
                    <container>
                        <args>
                            <arg>server</arg>
                        </args>
                        <ports>
                            <port>8080</port>
                        </ports>
                        <environment>
                            <DB_MIGRATION>1</DB_MIGRATION>
                        </environment>
                        <entrypoint>/entrypoint.sh</entrypoint>
                    </container>
                    <extraDirectories>
                        <paths>
                            <path>${project.basedir}/../bbcerts</path>
                            <path>${project.basedir}/target/jacoco-agent</path>
                            <path>${project.basedir}/docker</path>
                            <path>${project.basedir}/../src/main/resources/keypair</path>
                            <path>${project.basedir}/target/newrelic-agent</path>
                        </paths>
                        <permissions>
                            <permission>
                                <file>/entrypoint.sh</file>
                                <mode>755</mode>
                            </permission>
                        </permissions>
                    </extraDirectories>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <annotationProcessorPaths>
                        <annotationProcessorPath>
                            <groupId>org.hibernate</groupId>
                            <artifactId>hibernate-jpamodelgen</artifactId>
                            <version>5.4.2.Final</version>
                        </annotationProcessorPath>
                        <path>
                            <groupId>javax.xml.bind</groupId>
                            <artifactId>jaxb-api</artifactId>
                            <version>2.3.0</version>
                        </path>
                        <path>
                            <groupId>javax.annotation</groupId>
                            <artifactId>javax.annotation-api</artifactId>
                            <version>1.3.1</version>
                        </path>
                    </annotationProcessorPaths>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

编辑：不再监控这个问题，因为使用IntelliJ IDEA的社区版将满足我的需求，我不必切换IDE。我认为建议的答案将适用于一些人，如果不是大多数人的话；然而，由于我无法（也不愿意继续）使构建与另一个IDE一起工作，我没有选择它作为解决方案。