isBlank() 在本地工作，但是在推送到 heroku 时：找不到符号
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【中文标题】isBlank() 在本地工作，但是在推送到 heroku 时：找不到符号【英文标题】：isBlank() working locally, but when pushing to heroku: cannot find symbol 【发布时间】：2021-10-20 09:27:31 【问题描述】：我有一个在 localhost:8080 设置中运行的项目。我对 Heroku 和 git bash 以及所有这些实际上都很陌生。
将我的项目推送到 Heroku 时出现以下错误：
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Building on the Heroku-20 stack
remote: -----> Using buildpack: heroku/java
remote: -----> Java app detected
remote: -----> Installing JDK 1.8... done
remote: -----> Installing Maven 3.6.2... done
remote: -----> Executing Maven
remote: $ mvn -DskipTests clean dependency:list install
remote: [INFO] Scanning for projects...
remote: [INFO]
remote: [INFO] -------------------------< tkt:wepa_Projekti >--------------------------
remote: [INFO] Building wepa_Projekti 1.0-SNAPSHOT
remote: [INFO] --------------------------------[ jar ]---------------------------------
remote: [INFO] Downloading from tmc: https://maven.mooc.fi/releases/org/passay/passay/1.6.0/passay-1.6.0.pom
remote: [INFO] Downloading from central: https://repo.maven.apache.org/maven2/org/passay/passay/1.6.0/passay-1.6.0.pom
remote: [INFO] Downloaded from central: https://repo.maven.apache.org/maven2/org/passay/passay/1.6.0/passay-1.6.0.pom (15 kB at 148 kB/s)
remote: [INFO] Downloading from tmc: https://maven.mooc.fi/releases/org/springframework/boot/spring-boot-starter-validation/2.3.2.RELEASE/spring-boot-starter-validation-2.3.2.RELEASE.pom
remote: [INFO] Downloading from central: https://repo.maven.apache.org/maven2/org/springframework/boot/spring-boot-starter-validation/2.3.2.RELEASE/spring-boot-starter-validation-2.3.2.RELEASE.pom
remote: [INFO] Downloaded from central: https://repo.maven.apache.org/maven2/org/springframework/boot/spring-boot-starter-validation/2.3.2.RELEASE/spring-boot-starter-validation-2.3.2.RELEASE.pom (2.5 kB at 121 kB/s)
remote: [INFO] Downloading from tmc: https://maven.mooc.fi/releases/org/hibernate/validator/hibernate-validator/6.1.5.Final/hibernate-validator-6.1.5.Final.pom
remote: [INFO] Downloading from central: https://repo.maven.apache.org/maven2/org/hibernate/validator/hibernate-validator/6.1.5.Final/hibernate-validator-6.1.5.Final.pom
remote: [INFO] Downloaded from central: https://repo.maven.apache.org/maven2/org/hibernate/validator/hibernate-validator/6.1.5.Final/hibernate-validator-6.1.5.Final.pom (13 kB at 1.0 MB/s)
remote: [INFO] Downloading from tmc: https://maven.mooc.fi/releases/org/hibernate/validator/hibernate-validator-parent/6.1.5.Final/hibernate-validator-parent-6.1.5.Final.pom
remote: [INFO] Downloading from central: https://repo.maven.apache.org/maven2/org/hibernate/validator/hibernate-validator-parent/6.1.5.Final/hibernate-validator-parent-6.1.5.Final.pom
remote: [INFO] Downloaded from central: https://repo.maven.apache.org/maven2/org/hibernate/validator/hibernate-validator-parent/6.1.5.Final/hibernate-validator-parent-6.1.5.Final.pom (67 kB at 2.0 MB/s)
remote: [INFO] Downloading from tmc: https://maven.mooc.fi/releases/org/jboss/arquillian/arquillian-bom/1.1.11.Final/arquillian-bom-1.1.11.Final.pom
remote: [INFO] Downloading from central: https://repo.maven.apache.org/maven2/org/jboss/arquillian/arquillian-bom/1.1.11.Final/arquillian-bom-1.1.11.Final.pom
remote: [INFO] Downloaded from central: https://repo.maven.apache.org/maven2/org/jboss/arquillian/arquillian-bom/1.1.11.Final/arquillian-bom-1.1.11.Final.pom (11 kB at 967 kB/s)
remote: [INFO] Downloading from tmc: https://maven.mooc.fi/releases/org/jboss/shrinkwrap/shrinkwrap-bom/1.2.3/shrinkwrap-bom-1.2.3.pom
remote: [INFO] Downloading from central: https://repo.maven.apache.org/maven2/org/jboss/shrinkwrap/shrinkwrap-bom/1.2.3/shrinkwrap-bom-1.2.3.pom
remote: [INFO] Downloaded from central: https://repo.maven.apache.org/maven2/org/jboss/shrinkwrap/shrinkwrap-bom/1.2.3/shrinkwrap-bom-1.2.3.pom (4.0 kB at 443 kB/s)
remote: [INFO] Downloading from tmc: https://maven.mooc.fi/releases/org/jboss/shrinkwrap/resolver/shrinkwrap-resolver-bom/2.2.0/shrinkwrap-resolver-bom-2.2.0.pom
remote: [INFO] Downloading from central: https://repo.maven.apache.org/maven2/org/jboss/shrinkwrap/resolver/shrinkwrap-resolver-bom/2.2.0/shrinkwrap-resolver-bom-2.2.0.pom
remote: [INFO] Downloaded from central: https://repo.maven.apache.org/maven2/org/jboss/shrinkwrap/resolver/shrinkwrap-resolver-bom/2.2.0/shrinkwrap-resolver-bom-2.2.0.pom (5.3 kB at 331 kB/s)
remote: [INFO] Downloading from tmc: https://maven.mooc.fi/releases/org/jboss/shrinkwrap/descriptors/shrinkwrap-descriptors-bom/2.0.0-alpha-8/shrinkwrap-descriptors-bom-2.0.0-alpha-8.pom
remote: [INFO] Downloading from central: https://repo.maven.apache.org/maven2/org/jboss/shrinkwrap/descriptors/shrinkwrap-descriptors-bom/2.0.0-alpha-8/shrinkwrap-descriptors-bom-2.0.0-alpha-8.pom
remote: [INFO] Downloaded from central: https://repo.maven.apache.org/maven2/org/jboss/shrinkwrap/descriptors/shrinkwrap-descriptors-bom/2.0.0-alpha-8/shrinkwrap-descriptors-bom-2.0.0-alpha-8.pom (5.2 kB at 582 kB/s)
remote: [INFO] Downloading from tmc: https://maven.mooc.fi/releases/jakarta/validation/jakarta.validation-api/2.0.2/jakarta.validation-api-2.0.2.pom
remote: [INFO] Downloading from central: https://repo.maven.apache.org/maven2/jakarta/validation/jakarta.validation-api/2.0.2/jakarta.validation-api-2.0.2.pom
remote: [INFO] Downloaded from central: https://repo.maven.apache.org/maven2/jakarta/validation/jakarta.validation-api/2.0.2/jakarta.validation-api-2.0.2.pom (11 kB at 1.3 MB/s)
remote: [INFO] Downloading from tmc: https://maven.mooc.fi/releases/ognl/ognl/3.1.12/ognl-3.1.12.jar
remote: [INFO] Downloading from tmc: https://maven.mooc.fi/releases/org/springframework/boot/spring-boot-starter-validation/2.3.2.RELEASE/spring-boot-starter-validation-2.3.2.RELEASE.jar
remote: [INFO] Downloading from tmc: https://maven.mooc.fi/releases/org/hibernate/validator/hibernate-validator/6.1.5.Final/hibernate-validator-6.1.5.Final.jar
remote: [INFO] Downloading from tmc: https://maven.mooc.fi/releases/jakarta/validation/jakarta.validation-api/2.0.2/jakarta.validation-api-2.0.2.jar
remote: [INFO] Downloading from tmc: https://maven.mooc.fi/releases/org/passay/passay/1.6.0/passay-1.6.0.jar
remote: [INFO] Downloading from central: https://repo.maven.apache.org/maven2/org/passay/passay/1.6.0/passay-1.6.0.jar
remote: [INFO] Downloading from central: https://repo.maven.apache.org/maven2/org/springframework/boot/spring-boot-starter-validation/2.3.2.RELEASE/spring-boot-starter-validation-2.3.2.RELEASE.jar
remote: [INFO] Downloading from central: https://repo.maven.apache.org/maven2/org/hibernate/validator/hibernate-validator/6.1.5.Final/hibernate-validator-6.1.5.Final.jar
remote: [INFO] Downloading from central: https://repo.maven.apache.org/maven2/ognl/ognl/3.1.12/ognl-3.1.12.jar
remote: [INFO] Downloading from central: https://repo.maven.apache.org/maven2/jakarta/validation/jakarta.validation-api/2.0.2/jakarta.validation-api-2.0.2.jar
remote: [INFO] Downloaded from central: https://repo.maven.apache.org/maven2/org/springframework/boot/spring-boot-starter-validation/2.3.2.RELEASE/spring-boot-starter-validation-2.3.2.RELEASE.jar (4.8 kB at 58 kB/s)
remote: [INFO] Downloaded from central: https://repo.maven.apache.org/maven2/ognl/ognl/3.1.12/ognl-3.1.12.jar (236 kB at 2.1 MB/s)
remote: [INFO] Downloaded from central: https://repo.maven.apache.org/maven2/org/passay/passay/1.6.0/passay-1.6.0.jar (124 kB at 1.1 MB/s)
remote: [INFO] Downloaded from central: https://repo.maven.apache.org/maven2/jakarta/validation/jakarta.validation-api/2.0.2/jakarta.validation-api-2.0.2.jar (92 kB at 760 kB/s)
remote: [INFO] Downloaded from central: https://repo.maven.apache.org/maven2/org/hibernate/validator/hibernate-validator/6.1.5.Final/hibernate-validator-6.1.5.Final.jar (1.3 MB at 5.7 MB/s)
remote: [INFO]
remote: [INFO] --- maven-clean-plugin:3.1.0:clean (default-clean) @ wepa_Projekti ---
remote: [INFO]
remote: [INFO] --- maven-dependency-plugin:3.1.2:list (default-cli) @ wepa_Projekti ---
remote: [INFO]
remote: [INFO] --- maven-resources-plugin:3.1.0:resources (default-resources) @ wepa_Projekti ---
remote: [INFO] Using 'UTF-8' encoding to copy filtered resources.
remote: [INFO] Copying 4 resources
remote: [INFO] Copying 21 resources
remote: [INFO]
remote: [INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) @ wepa_Projekti ---
remote: [INFO] Changes detected - recompiling the module!
remote: [INFO] Compiling 44 source files to /tmp/build_b0fadb36/target/classes
remote: [INFO] /tmp/build_b0fadb36/src/main/java/projekti/CustomErrorController.java: /tmp/build_b0fadb36/src/main/java/projekti/CustomErrorController.java uses or overrides a deprecated API.
remote: [INFO] /tmp/build_b0fadb36/src/main/java/projekti/CustomErrorController.java: Recompile with -Xlint:deprecation for details.
remote: [INFO] -------------------------------------------------------------
remote: [ERROR] COMPILATION ERROR :
remote: [INFO] -------------------------------------------------------------
remote: [ERROR] /tmp/build_b0fadb36/src/main/java/projekti/SaunojaService.java:[154,120] cannot find symbol
remote: symbol: method isBlank()
remote: location: class java.lang.String
remote: [ERROR] /tmp/build_b0fadb36/src/main/java/projekti/NotificationService.java:[54,81] cannot find symbol
remote: symbol: method isBlank()
remote: location: class java.lang.String
remote: [ERROR] /tmp/build_b0fadb36/src/main/java/projekti/MessageService.java:[82,71] cannot find symbol
remote: symbol: method isBlank()
remote: location: class java.lang.String
remote: [ERROR] /tmp/build_b0fadb36/src/main/java/projekti/CommentService.java:[56,71] cannot find symbol
remote: symbol: method isBlank()
remote: location: class java.lang.String
remote: [ERROR] /tmp/build_b0fadb36/src/main/java/projekti/AccountFreezeService.java:[71,51] cannot find symbol
remote: symbol: method isBlank()
remote: location: class java.lang.String
remote: [INFO] 5 errors
remote: [INFO] -------------------------------------------------------------
remote: [INFO] ------------------------------------------------------------------------
remote: [INFO] BUILD FAILURE
remote: [INFO] ------------------------------------------------------------------------
remote: [INFO] Total time: 12.772 s
remote: [INFO] Finished at: 2021-08-18T14:35:20Z
remote: [INFO] ------------------------------------------------------------------------
remote: [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project wepa_Projekti: Compilation failure: Compilation failure:
remote: [ERROR] /tmp/build_b0fadb36/src/main/java/projekti/SaunojaService.java:[154,120] cannot find symbol
remote: [ERROR] symbol: method isBlank()
remote: [ERROR] location: class java.lang.String
remote: [ERROR] /tmp/build_b0fadb36/src/main/java/projekti/NotificationService.java:[54,81] cannot find symbol
remote: [ERROR] symbol: method isBlank()
remote: [ERROR] location: class java.lang.String
remote: [ERROR] /tmp/build_b0fadb36/src/main/java/projekti/MessageService.java:[82,71] cannot find symbol
remote: [ERROR] symbol: method isBlank()
remote: [ERROR] location: class java.lang.String
remote: [ERROR] /tmp/build_b0fadb36/src/main/java/projekti/CommentService.java:[56,71] cannot find symbol
remote: [ERROR] symbol: method isBlank()
remote: [ERROR] location: class java.lang.String
remote: [ERROR] /tmp/build_b0fadb36/src/main/java/projekti/AccountFreezeService.java:[71,51] cannot find symbol
remote: [ERROR] symbol: method isBlank()
remote: [ERROR] location: class java.lang.String
remote: [ERROR] -> [Help 1]
remote: [ERROR]
remote: [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
remote: [ERROR] Re-run Maven using the -X switch to enable full debug logging.
remote: [ERROR]
remote: [ERROR] For more information about the errors and possible solutions, please read the following articles:
remote: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
remote:
remote: ! ERROR: Failed to build app with Maven
remote: We're sorry this build is failing! If you can't find the issue in application code,
remote: please submit a ticket so we can help: https://help.heroku.com/
我的 Java 版本：
$ java -version
openjdk version "11.0.9.1" 2020-11-04
OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.9.1+1)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.9.1+1, mixed mode)
似乎问题可能出在项目的依赖关系上，但我不明白的是，为什么问题不会在本地发生。
项目 pom.xml：
<?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">
<modelVersion>4.0.0</modelVersion>
<groupId>tkt</groupId>
<artifactId>wepa_Projekti</artifactId>
<name>wepa_Projekti</name>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.2.RELEASE</version>
<relativePath/>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.thymeleaf.extras</groupId>
<artifactId>thymeleaf-extras-springsecurity5</artifactId>
</dependency>
<dependency>
<groupId>org.thymeleaf.extras</groupId>
<artifactId>thymeleaf-extras-java8time</artifactId>
<version>3.0.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
</dependency>
<dependency>
<groupId>org.passay</groupId>
<artifactId>passay</artifactId>
<version>1.6.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
</dependency>
<dependency>
<groupId>org.fluentlenium</groupId>
<artifactId>fluentlenium-junit</artifactId>
<version>3.7.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.fluentlenium</groupId>
<artifactId>fluentlenium-assertj</artifactId>
<version>3.7.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>htmlunit-driver</artifactId>
</dependency>
<!-- TMC -->
<dependency>
<groupId>fi.helsinki.cs.tmc</groupId>
<artifactId>edu-test-utils</artifactId>
<version>0.4.2</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>tmc</id>
<name>TMC repo</name>
<url>https://maven.mooc.fi/releases</url>
<releases>
<enabled>true</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>tmc</id>
<name>TMC repo</name>
<url>https://maven.mooc.fi/releases</url>
<releases>
<enabled>true</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
</pluginRepository>
</pluginRepositories>
</project>
【问题讨论】：
我可以在上面看到您已经安装了 JDK 1.8。这个版本没有isBlank()。为此，您至少需要 Java 11。 heroku 使用的版本可能与命令行不同，因此您应该检查一下。
感谢您的快速答复！我确实似乎安装了1.8版本。但为什么？会不会是 1.8 的 maven.compiler.source 和 .target 导致了这种情况？
我会这么说。您是否测试过将其更改为 Java 11？
Heroku documentation 声明您应该添加一个文件“system.properties”，指定 Heroku 应该使用的所需 Java 版本：“java.runtime.version=11”
您好，再次感谢您的评论。我尝试将 maven.compiler.source 和 .target 更改为 1.11，然后更改为 11。两者都给出了一个新错误：“Fatal error compile: invalid target release: 11(or 1.11)”。此外，在推送到 Herkoku 时，使用 Thomas 提到的行添加 system.properties 文件并没有将安装的 JDK 版本从 1.8 更改。
【参考方案1】：
很抱歉通知您，但有一个与 Muhammad Shah 的有效答案几乎相同的问题：Heroku cannot deploy Java 11 Spring Boot App。
答案仍然与 Thomas Kläger 在这里给出的相同。我的错误是我在资源文件夹中创建了 system.proterties 文件，但它应该位于根目录中。
感谢所有回答和评论的人！
【讨论】：
【参考方案2】：我无法发表评论，所以我将其作为答案：
您似乎在 Java 1.8 版本上使用 Java 11+ 功能。确保您的 IDE 可以使用 Java 11 JDK（例如在 Eclipse 中查看如何设置 here）。
然后，在您的 .pom 文件中，更改：
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
到：
<properties>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
</properties>
这将使 Maven 将您的项目编译为 Java 11 而不是 Java 8。也许您需要更新您的 Maven 版本，以便它可以正确识别 Java 11。
【讨论】：
我都试过了。将 maven.compiler.source 和 .target 更改为 11 时，我收到一个新错误：“致命错误编译：无效的目标版本：11”。我正要想出一个 java 1.8 的方法来做 isBlank() .. 女巫很可怜 :( 检查“mvn --version”时，我得到：Apache Maven 3.8.1 和 Java 版本 11.0.9.1 你是用mvn命令行工具编译还是用Eclipse之类的IDE？mvn --version 的输出与使用 IDE 无关。确保正确配置 IDE 以使用 Java 11 JDK
我在本地使用 Netbeans，一切正常。但是当使用 Git Bash 推送到 Heroku 时，就会出现错误。以上是关于isBlank() 在本地工作，但是在推送到 heroku 时：找不到符号的主要内容，如果未能解决你的问题，请参考以下文章
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