Develop Reference

Maven Guava missing method Sets.symmetricDifference

I have a very strange problem. I added the following dependency to my pom.xml
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>31.0.1-jre</version>
</dependency>
When I try to call write the following code:
import com.google.common.collect.Sets;
Sets.symmetricDifference(currentSet, referencedSet);
My compiler says: Cannot resolve method 'symmetricDifference' in 'Sets'
Yet I know that this method exists, I even found it in google's repository
Does anyone understand why this might happen? I also tried different guava versions, but nothing seems to help.
Edit
Error message when executing mvn install:
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /C:/somePath/backend/src/main/java/someOtherPath/service/DataVerificationServiceImpl.java:[58,76] cannot find symbol
symbol: method symmetricDifference(java.util.Set<org.springframework.data.util.Pair<java.time.ZonedDateTime,java.time.ZonedDateTime>>,java.util.Set<org.springframework.data.util.Pair<java.time.ZonedDateTime,java.time.ZonedDateTime>>)
location: class com.google.common.collect.Sets
Edit 2:
Full 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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.4.5</version>
</parent>
<artifactId>my_project</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>My project</name>
<description>My Project Description</description>
<properties>
<java.version>11</java.version>
<keycloak.version>15.0.0</keycloak.version>
</properties>
<dependencies>
<!-- Spring boot -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.keycloak</groupId>
<artifactId>keycloak-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-boot-starter</artifactId>
<version>3.0.0</version>
</dependency>
<dependency>
<groupId>org.mapstruct</groupId>
<artifactId>mapstruct-processor</artifactId>
<version>1.4.2.Final</version>
</dependency>
<dependency>
<groupId>org.mapstruct</groupId>
<artifactId>mapstruct</artifactId>
<version>1.4.2.Final</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok-mapstruct-binding</artifactId>
<version>0.2.0</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.20</version>
</dependency>
<dependency>
<groupId>org.mariadb.jdbc</groupId>
<artifactId>mariadb-java-client</artifactId>
<version>2.7.3</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.5.7.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-jpamodelgen</artifactId>
<version>5.5.7.Final</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
</dependency>
<dependency>
<groupId>org.springdoc</groupId>
<artifactId>springdoc-openapi-maven-plugin</artifactId>
<version>1.3</version>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>31.0.1-jre</version>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.keycloak.bom</groupId>
<artifactId>keycloak-adapter-bom</artifactId>
<version>${keycloak.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<finalName>application</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<layers>
<enabled>true</enabled>
</layers>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
<plugin>
<groupId>org.springdoc</groupId>
<artifactId>springdoc-openapi-maven-plugin</artifactId>
<version>1.2</version>
<configuration>
<apiDocsUrl>http://localhost:8080/v3/api-docs</apiDocsUrl>
<outputFileName>swagger.json</outputFileName>
<outputDir>srcrces</outputDir>
<skip>false</skip>
</configuration>
<executions>
<execution>
<id>integration-test</id>
<goals>
<goal>generate</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>11</source>
<target>11</target>
</configuration>
</plugin>
</plugins>
</build>
</project>

The imports and usage of the library is correct.
The version also includes the method that you want, I've just checked.
This indicates that the compiler is unable to locate the relevant jar on the classpath.
Can you please run mvn install and if it reports any errors add them to the original post and also add a comment here to notify me.
EDIT:
The “cannot find symbol” error comes up mainly when we try to use a variable that is not defined or declared in our program.
When our code compiles, the compiler needs to verify all identifiers we have. The error “cannot find symbol” means we're referring to something that the compiler doesn't know about.
As it turns out, in your case it is a dependency version conflict which can be detected and resolved like this https://pretagteam.com/question/conflicting-library-version-in-a-java-maven-project

Spring-Boot autoconfigure

Hello Team i have a error to init a Spring-Boot aplication because i change the parent version of spring-boot-starter-parent 2.1.3.Release to 2.2.4.RELEASE because im doing a changes with azure appConfiguration but when i trying to execture it im reciving the nex error.
ERROR 14244 --- [ main] o.s.boot.SpringApplication : Application run failed
java.lang.IllegalStateException: Error processing condition on org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration.propertySourcesPlaceholderConfigurer
at org.springframework.boot.autoconfigure.condition.SpringBootCondition.matches(SpringBootCondition.java:60) ~[spring-boot-autoconfigure-2.2.4.RELEASE.jar:2.2.4.RELEASE]
at org.springframework.context.annotation.ConditionEvaluator.shouldSkip(ConditionEvaluator.java:108) ~[spring-context-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForBeanMethod(ConfigurationClassBeanDefinitionReader.java:184) ~[spring-context-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForConfigurationClass(ConfigurationClassBeanDefinitionReader.java:144) ~[spring-context-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitions(ConfigurationClassBeanDefinitionReader.java:120) ~[spring-context-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:331) ~[spring-context-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:236) ~[spring-context-5.2.3.RELEASE.jar:5.2.3.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:275) ~[spring-context-5.2.3.RELEASE.jar:5.2.3.RELEASE]
and my rest POM is this.
<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>
<artifactId>action-book-rest</artifactId>
<name>Action Book (Rest)</name>
<parent>
<groupId>com.biit</groupId>
<artifactId>action-book</artifactId>
<version>0.2.1-SNAPSHOT</version>
</parent>
<properties>
<main.basedir>${basedir}/..</main.basedir>
</properties>
<dependencies>
<dependency>
<groupId>com.biit</groupId>
<artifactId>action-book-core</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>com.microsoft.azure</groupId>
<artifactId>spring-cloud-starter-azure-appconfiguration-config</artifactId>
<version>1.2.5</version>
</dependency>
<dependency>
<groupId>com.microsoft.azure</groupId>
<artifactId>spring-cloud-azure-feature-management-web</artifactId>
<version>1.2.2</version>
</dependency>
<dependency>
<groupId>com.microsoft.azure</groupId>
<artifactId>spring-cloud-azure-appconfiguration-config</artifactId>
<version>1.2.2</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- Telemetry -->
<dependency>
<groupId>com.microsoft.azure</groupId>
<artifactId>azure</artifactId>
<version>${azure.version}</version>
</dependency>
<!-- Add Log4j2 Dependency -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>
<!-- Testing -->
<dependency>
<groupId>org.testng</groupId>
<artifactId>testng</artifactId>
<version>${org.testng.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<!-- if this is not excluded and 'spring-boot-starter-log4j2' enabled,
testng causes a 'Cannot instantiate class' for all tests -->
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.subethamail</groupId>
<artifactId>subethasmtp-wiser</artifactId>
<version>1.2</version>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>${springfox-swagger.version}</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>${springfox-swagger.version}</version>
</dependency>
<dependency>
<groupId>com.biit</groupId>
<artifactId>action-underlying-model</artifactId>
<version>${action-underlying-model.version}</version>
</dependency>
<dependency>
<groupId>com.biit</groupId>
<artifactId>openproject-database-structure</artifactId>
<version>${openproject-database-structure.version}</version>
</dependency>
<dependency>
<groupId>org.apache.tinkerpop</groupId>
<artifactId>gremlin-driver</artifactId>
<version>${tinkerpop.version}</version>
</dependency>
<dependency>
<groupId>com.biit</groupId>
<artifactId>open-project-structure</artifactId>
<version>${open-project-structure.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<useFile>false</useFile>
<trimStackTrace>false</trimStackTrace>
<suiteXmlFiles>
<suiteXmlFile>src/test/resources/testng.xml</suiteXmlFile>
</suiteXmlFiles>
<useSystemClassLoader>false</useSystemClassLoader>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
<!-- Do not deploy this module in artifact -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-deploy-plugin</artifactId>
<configuration>
<skip>true</skip>
</configuration>
</plugin>
</plugins>
</build>
</project>
I don't know what my mistake is, or what to try.

Try obtaining the list with all dependencies and see if there is any conflict between them:
mvn dependency:tree

I am pretty sure that the issue is on the stacktrace of the error that you are not showing. Probably some chained exception that prevents the propertySourcesPlaceholderConfigurer to be created. A missing property or a needed bean that also fails. Take a look on it or post the complete stacktrace to be possible for us to dig into it.

Spring boot external properties not working for boot 2.0.0.RELEASE with spring batch inside

I'm working on spring boot app that contains only one batch job, here is my pom.xml for the batch project (note that this is part of the multi module project)
<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>parentPOM</artifactId>
<groupId>groupiD</groupId>
<version>VERSION</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>BATCH_PROJECT</artifactId>
<properties>
<!-- <spring-boot.version>2.2.0.RELEASE</spring-boot.version> taken from parent pom-->
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>8</java.version>
<spring-batch.version>4.2.0.RELEASE</spring-batch.version>
<spring.version>5.2.0.RELEASE</spring.version>
<ibm-mq-spring-jms-stater.version>2.2.0</ibm-mq-spring-jms-stater.version>
<jackson.version>2.10.1</jackson.version>
<mockito-core.version>3.1.0</mockito-core.version>
<slf4j-log4j12.version>1.7.30</slf4j-log4j12.version>
<guava.version>28.0-jre</guava.version>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.2</version>
<configuration>
<excludes>
<exclude>**IntegrationTest.java</exclude>
</excludes>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>${spring-boot.version}</version>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.springframework.batch</groupId>
<artifactId>spring-batch-core</artifactId>
<version>${spring-batch.version}</version>
</dependency>
<dependency>
<groupId>${project.groupId}</groupId>
<artifactId>INTERNAL_CODE</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.batch</groupId>
<artifactId>spring-batch-test</artifactId>
<version>${spring-batch.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<version>${spring-boot.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.testcontainers</groupId>
<artifactId>testcontainers</artifactId>
<version>1.12.3</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<version>${spring-boot.version}</version>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-core</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
<dependency>
<groupId>com.ibm.mq</groupId>
<artifactId>mq-jms-spring-boot-starter</artifactId>
<version>${ibm-mq-spring-jms-stater.version}</version>
</dependency>
<dependency>
<groupId>com.ibm.db2</groupId>
<artifactId>db2jcc4</artifactId>
<version>${db2jcc4.version}</version>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>${guava.version}</version>
</dependency>
</dependencies>
</project>
After building the project i'm trying to run it with
java -jar my_app.jar --spring.config.location=file:./prop.properties --spring.config.name=prop
Which is not working my job is failing to pickup the properties defined that (code inside #Value not resolved)
Insinde of configuration class in the code i have static PropertySourcesPlaceholderConfigurer (maybe that it somehow relevant, but I doubt it..)
I am using windows 10, tried to execute from different shells (cmd and git bash)
What I'm missing here?

It turns out that spring.profiles=batch line inside property file somehow breaks that file resolution, commenting it out fixed the issue.
UPDATE
Actually, that was a typo :\

Spring boot application displaying white label error when executing jar file

I have tried searching in stackoverflow but couldn't able to find a viable perfect solution to my problem and hence would like to post here.
When I run my spring boot application via eclipse as spring boot app, it is working fine and displaying proper page. But when I converted into executable jar file and try to run via command prompt "java -jar abc.jar", the application is showing white label error.
Here is my application structure.
My controller here,
#RestController
#RequestMapping("/")
public class WebController {
#RequestMapping(value="/")
public ModelAndView home() {
ModelAndView app = new ModelAndView();
app.setViewName("home2");
return app;
}
}
My pom.xml file
<?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>com.eradar</groupId>
<artifactId>eradar-poc</artifactId>
<version>0.0.2-SNAPSHOT</version>
<packaging>jar</packaging>
<!-- <packaging>war</packaging> -->
<name>eRadarPOC</name>
<description>Demo project for Spring JPA - PostgreSQL -
AngularJS</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<!-- <version>1.5.4.RELEASE</version> -->
<version>1.5.9.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<drools.version>7.3.0.Final</drools.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.kie</groupId>
<artifactId>kie-api</artifactId>
<version>${drools.version}</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-core</artifactId>
<version>${drools.version}</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-compiler</artifactId>
<version>${drools.version}</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-templates</artifactId>
<version>${drools.version}</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-decisiontables</artifactId>
<version>${drools.version}</version>
</dependency>
<dependency>
<groupId>org.kie</groupId>
<artifactId>kie-ci</artifactId>
<version>${drools.version}</version>
</dependency>
<dependency>
<groupId>com.googlecode.json-simple</groupId>
<artifactId>json-simple</artifactId>
<version>1.1</version>
</dependency>
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20080701</version>
</dependency>
<dependency>
<groupId>javax.ws.rs</groupId>
<artifactId>javax.ws.rs-api</artifactId>
<version>2.0.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.xml.bind/jaxb-api -->
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.3.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
<configuration>
<executable>true</executable>
</configuration>
</plugin>
<!-- Added -->
<!-- <plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.1</version>
<executions>
<execution>
<id>tomcat-run</id>
<goals>
<goal>exec-war-only</goal>
</goals>
<phase>package</phase>
<configuration>
<path>/</path>
<enableNaming>false</enableNaming>
<finalName>webapp.jar</finalName>
<charset>utf-8</charset>
</configuration>
</execution>
</executions>
</plugin> -->
<!-- Ended -->
</plugins>
<finalName>webappexecutableJar</finalName>
</build>
Can you please suggest some solutions? If you guys have encountered any similar issues like mine, how did you handle? Thanks a lot.

Make sure that you have below dependencies in your POM
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
</dependency>
check your application.properties and add
spring.mvc.view.prefix=/WEB-INF/jsps/
spring.mvc.view.suffix=.jsp

Do define the prefix and suffix mapping in your application.properties like below and try
spring.mvc.view.prefix: /WEB-INF/jsps
spring.mvc.view.suffix: .jsp in your application.properties
Please check the file below for the mapping
https://github.com/hellokoding/springboot-jsp/blob/master/src/main/resources/application.properties
Also check the sample springboot project with jsp like below https://hellokoding.com/spring-boot-hello-world-example-with-jsp/

project is running and working but pom.xml is showing error

I have one spring project which is running and working fine, but the pom.xml is showing a red color error sign as shown in attached image.
image of project hierarchy
I am not able to understand why it is showing this error, even my project is running and working fine.
Please suggest how to remove this red tag from project hierarchy.
Thanks in advance
POM.XML
<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>TAS_EMS</groupId>
<artifactId>TAS_EMS</artifactId>
<version>0.0.2</version>
<packaging>jar</packaging>
<name>TAS_EMS</name>
<description>TAS_EMS</description>
<organization>
<name>TATA POWER SED</name>
<url>http://www.tatapowersed.com</url>
</organization>
<properties>
<!-- Spring -->
<spring-framework.version>4.1.6.RELEASE</spring-framework.version>
<springboot-framework.version>1.2.3.RELEASE</springboot-framework.version>
<!-- SqLite -->
<sqlite.version>3.7.2</sqlite.version>
<!-- Hibernate / JPA -->
<hibernate.version>4.2.1.Final</hibernate.version>
<!-- JSON -->
<jackson.version>2.5.2</jackson.version>
<!-- Portlet /JSON RPC -->
<portlet.version>2.0</portlet.version>
<!--HTTP / JSONRPC -->
<commons-codec.version>1.9</commons-codec.version>
<httpcore.version>4.3.3</httpcore.version>
<!-- REST XML Mapping -->
<jaxb.version>2.2.12</jaxb.version>
</properties>
<dependencies>
<!-- Spring Jetty -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>${springboot-framework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jetty</artifactId>
<version>${springboot-framework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring-framework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<version>${springboot-framework.version}</version>
<scope>test</scope>
</dependency>
<!-- Spring JDBC -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring-framework.version}</version>
</dependency>
<!-- Spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring-framework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring-framework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring-framework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${spring-framework.version}</version>
</dependency>
<!-- Hibernate -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>${hibernate.version}</version>
</dependency>
<!-- Log4J -->
<!-- <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId>
<version>1.7.12</version> </dependency> -->
<!-- SQLite database JDBC -->
<dependency>
<groupId>org.xerial</groupId>
<artifactId>sqlite-jdbc</artifactId>
<version>${sqlite.version}</version>
</dependency>
<!-- json dependencies + -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>${jackson.version}</version>
<optional>true</optional>
</dependency>
<!-- | servlet\portlet dependencies + -->
<dependency>
<groupId>javax.portlet</groupId>
<artifactId>portlet-api</artifactId>
<version>${portlet.version}</version>
<optional>true</optional>
<scope>provided</scope>
</dependency>
<!-- | Rest XML Mapping + -->
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>${jaxb.version}</version>
</dependency>
<!-- <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-security</artifactId>
<version>1.2.3.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-actuator</artifactId> <version>1.2.3.RELEASE</version>
</dependency> -->
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j-cypher-compiler-2.1</artifactId>
<version>2.1.5</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-solr</artifactId>
<version>1.2.3.RELEASE</version>
</dependency>
<dependency>
<groupId>commons-httpclient</groupId>
<artifactId>commons-httpclient</artifactId>
<version>3.1</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>
spring-boot-starter-data-elasticsearch
</artifactId>
<version>1.2.3.RELEASE</version>
</dependency>
<dependency>
<groupId>org.apache.activemq</groupId>
<artifactId>activemq-client</artifactId>
<version>5.10.1</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-eclipse-plugin</artifactId>
<version>2.9</version>
<configuration>
<downloadSources>true</downloadSources>
<downloadJavadocs>false</downloadJavadocs>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>com.tpcsed.tasems.app.service.StartApp</mainClass>
<classpathPrefix>dependency-jars/</classpathPrefix>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.5.1</version>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<includeScope>runtime</includeScope>
<outputDirectory>${project.build.directory}/dependency-jars/</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>

I got the same error as mentioned above.
To resolve the error i simply change the packaging type of the application from JAR to WAR.
This resolve the error.
Make sure to update the project after changing the configuration.
Here is my pom file
<?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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.5.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.shubhasish.boot.practice</groupId>
<artifactId>spring-boot-practice</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>spring-boot-practice</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.source>1.8</maven.compiler.source>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency>
</dependencies>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>

Add below lines in your pom.xml in section:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.1.1</version>
</plugin>
Then update the project from maven by right click on Project folder -> Maven -> Update Project
Done!!
Reference:
https://github.com/sarl/sarl/issues/921#issuecomment-503858707

eclipse is sometimes error with no reason, please try to select all->copy->delete and then paste content and save, it might help.

Could you post the pom.xml and show the error that Eclipse throws?
Eclipse does this sometimes.
You can try different things:
1) If you can, disable validation: go to Window->Preferences
choose "Validation" in the left Menu (it's right below "Terminal"). Click "Disable all" then "Apply"
2) run a maven configuration with the Goals "clean package"
3) restart Eclipse
If you see no errors in your source code that means that all your dependencies where imported successfully

Refer to these solutions for your erroneous scenario which are answered here.