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Problem while executing mvn liquibase:diff where snapshot us used as target url

Using liquibase with maven spring boot project have generated the snapshot at one state of db later tried generating the difference between the snapshot and online db using mvn liquibase:diff.
liquibase.properties as follows.
changeLogFile=src/main/resources/bd.changeLog-base.xml
diffChangeLogFile=src/main/resources/bd.changeLog-base.xml
outputChangeLogFile=src/main/resources/liquibase-new-changeLog.xml
url=offline:mysql?snapshot=src/main/resources/snap_shot.json
driver=com.mysql.jdbc.Driver
referenceDriver=com.mysql.jdbc.Driver
referenceUrl=jdbc:mysql://localhost:3306/db_sample
referenceUsername=yyyy
referencePassword=xxxx
using the following maven-plugin dependency in 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 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>2.4.2</version>-->
<version>2.2.2.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>Liquibaseapplicationexample</groupId>
<artifactId>Liquibaseapplicationexample</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.liquibase</groupId>
<artifactId>liquibase-core</artifactId>
</dependency>
</dependencies>
<build>
<finalName>liquibase-demo</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
<plugin>
<groupId>org.liquibase</groupId>
<artifactId>liquibase-maven-plugin</artifactId>
<version>3.5.5</version>
<configuration>
<propertyFile>src/main/resources/liquibase/config/liquibase.properties</propertyFile>
<promptOnNonLocalDatabase>false</promptOnNonLocalDatabase>
</configuration>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>2.2.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
<version>2.2.2.RELEASE</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
<profiles>
<profile>
<id>development</id>
<properties>
<build.profile.id>development</build.profile.id>
</properties>
</profile>
</profiles>
</project>
I am getting following error.
[INFO] Scanning for projects...
[INFO]
[INFO] ------< Liquibaseapplicationexample:Liquibaseapplicationexample >-------
[INFO] Building Liquibaseapplicationexample 0.0.1-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- liquibase-maven-plugin:3.6.1:diff (default-cli) # Liquibaseapplicationexample ---
[INFO] ------------------------------------------------------------------------
[INFO] Parsing Liquibase Properties File
[INFO] File: src/main/resources/liquibase/config/liquibase.properties
[INFO] 'outputChangeLogFile' in properties file is not being used by this task.
[INFO] ------------------------------------------------------------------------
[INFO] Starting Liquibase at Mon, 05 Apr 2021 01:21:53 IST (version 3.5.5 built at 2018-04-11 09:05:04)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.778 s
[INFO] Finished at: 2021-04-05T01:21:53+05:30
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.liquibase:liquibase-maven-plugin:3.5.5:diff (default-cli) on project Liquibaseapplicationexample: Error setting up or running Li
quibase: liquibase.exception.UnexpectedLiquibaseException: Cannot parse snapshot offline:mysql?snapshot=src/main/resources/snap_shot.json: src/main/resources/snap_shot.j
son does not exist -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException.
Please help in solving this issue!

For me this issue fixed by upgrading liquibase-maven-plugin from 3.5.5 version to 3.10.1.
<groupId>org.liquibase</groupId>
<artifactId>liquibase-maven-plugin</artifactId>
<version>3.10.1</version>

Fatal error compiling: invalid target release: 11 during pushing to heroku

im trying to deploy my back end application to heroku
bun when I run this command
git push --force heroku-be-app splitting-staging-be:master
im getting this error
[INFO] Downloaded from central: https://repo.maven.apache.org/maven2/com/thoughtworks/qdox/qdox/2.0-M9/qdox-2.0-M9.jar (317 kB at 7.6 MB/s)
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 24 source files to /tmp/build_4e875976/target/classes
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 12.593 s
[INFO] Finished at: 2020-12-21T15:28:14Z
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project backend: Fatal error compiling: invalid target release: 11 -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
! ERROR: Failed to build app with Maven
We're sorry this build is failing! If you can't find the issue in application code,
please submit a ticket so we can help: https://help.heroku.com/
! Push rejected, failed to compile Java app.
! Push failed
This 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 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>2.4.0</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>vs</groupId>
<artifactId>backend</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>backend</name>
<description>Main server voor van streek project</description>
<properties>
<java.version>15</java.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.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-core</artifactId>
<version>5.4.1</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>5.3.1</version>
</dependency>
<dependency>
<groupId>com.sun.mail</groupId>
<artifactId>jakarta.mail</artifactId>
<version>1.6.5</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-compiler-plugin</artifactId>
<version>3.8.0</version>
<configuration>
<source>15</source> <!-- maven.compiler.source -->
<target>15</target> <!-- maven.compiler.target -->
</configuration>
</plugin>
</plugins>
</build>
</project>

I solved this problem by adding a new file system.properties and the content added to the file is java.runtime.version=11 (For me I am using JDK 11).
java.runtime.version=11

I would try focusing on why maven complains about invalid release 11 (Fatal error compiling: invalid target release: 11).
As seen in your pom.xml config you clearly intend to use version 15, so I would suggest to investigate why there is a problem with version 11.
Check $JAVA_HOME environment variable, system.properties file, etc.
Also try debug route suggested in official docs or a Q&A on a similar topic.

You must use the specific version of Java supported by Heroku. The following versions supported are:
Java 7 - 1.7.0_292
Java 8 - 1.8.0_282
Java 11 - 11.0.10
Java 13 - 13.0.6
Java 15 - 15.0.2
Set a java.runtime.version property of the system.properties file, create a system.properties file if one does not already exist.
java.runtime.version = SUPPORTED_VERSION
Read more in heroku-java-support

This is what I have experienced today.
I have been using jdk 1.8, and then have to install jdk 1.11.
But, after running mvnw through my shell script file dep.sh, it failed to build jar.
#!/bin/bash
MVN=$(pwd)/mvnw
echo "[1/2] Building app.jar ..."
$MVN clean package -Dmaven.test.skip=true
dep.sh calls mvnw script file with goal clan package
Error
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile
(default-compile) on project dictation:
Fatal error compiling: invalid target release: 11 -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
My pom.xml is configured with jdk 1.11. But it does not solve the build error.
<project ...>
<properties>
<java.version>11</java.version>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>11</source><!-- 1.11 not working -->
<target>11</target><!-- 1.11 not working -->
</configuration>
</plugin>
</plugins>
</build>
</project>
build failure
When I installed jdk 1.8, JAVA_HOME was set to /my/jdk/1.8/dir, which is used for bundling jar.
I set JAVA_HOME to /my/jdk/1.111/dir in dep.sh, it works without error.
#!/bin/bash
JAVA_HOME="/C/Program Files/Java/jdk-11.0.9"
MVN=$(pwd)/mvnw
echo "[1/2] Building app.jar ..."
$MVN clean package -Dmaven.test.skip=true

create system.properties file and Add java.runtime.version=11

hamcrest-core: jar:1.4-atlassian-1 could not be resolved on MVN clean install on Spring Boot project

Here is my pom
<?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>2.3.1.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.mailer</groupId>
<artifactId>portfolio</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>portfolio</name>
<description>portfolio services</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-mail</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.mailjet</groupId>
<artifactId>mailjet-client</artifactId>
<version>4.2.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Build logs:
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------< com.mailer:portfolio >------------------------
[INFO] Building portfolio 0.0.1-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
.
.
.
[WARNING] The POM for org.hamcrest:hamcrest-core:jar:1.4-atlassian-1 is missing, no dependency information available
.
.
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.22.2:test (default-test) on project portfolio: Execution default-test of goal org.apache.maven.plugins:maven-surefire-plugin:2.22.2:test failed: Plugin org.apache.maven.plugins:maven-surefire-plugin:2.22.2 or one of its dependencies could not be resolved: Failure to find org.hamcrest:hamcrest-core:jar:1.4-atlassian-1 in https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginResolutionException
**
Any idea why am getting this error related to hamcrest jar? I added the same version of the jar in .m2/repo/... but I still get the same error. Any idea which dependency in this POM is using it internally? Do I have to change any version?
Command used to build
mvn clean install
If I run this project as Spring Boot app then the service is up but what I need is a jar out of this to host in a cloud.

This was the issue with my local repository. I had to point to a new repo location under .m2 in settings.xml.

Could not resolve dependencies for project in heroku

I am trying to deploy maven web app in the Heroku which have a dependency on some other application. When I am trying to deploy the app and getting this error. I have no clue what is going wrong in passing the dependency.
This is my pom.xml file
http://maven.apache.org/xsd/maven-4.0.0.xsd">
4.0.0
org.springframework.boot
spring-boot-starter-parent
2.1.3.RELEASE
com.merizameen
merizameen
0.0.1-SNAPSHOT
merizameen
Frontend project for Merizameen
<properties>
<start-class>com.merizameen.MerizameenApplication</start-class>
<java.version>1.8</java.version>
</properties>
<dependencies>
<!-- MY PROJECT -->
<dependency>
<groupId>com.merizameen</groupId>
<artifactId>merizameenbackend</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</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>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
Error Logs---------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 6.953 s
[INFO] Finished at: 2019-04-16T18:29:11+00:00
[INFO] Final Memory: 20M/162M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project merizameen: Could not resolve dependencies for project com.merizameen:merizameen:jar:0.0.1-SNAPSHOT: Could not find artifact com.merizameen:merizameenbackend:jar:0.0.1-SNAPSHOT -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException
! ERROR: Failed to build app with Maven
We're sorry this build is failing! If you can't find the issue in application code,
please submit a ticket so we can help: https://help.heroku.com/
! Push rejected, failed to compile Java app.
! Push failed

You'll need to add com.merizameen:merizameenbackend as an un-managed dependency with a command like:
$ mvn deploy:deploy-file -Durl=file:///path/to/yourproject/repo/ -Dfile=merizameenbackend.jar -DgroupId=com.merizameen -DartifactId=merizameenbackend -Dpackaging=jar -Dversion=1.0
See this guide: https://devcenter.heroku.com/articles/local-maven-dependencies

Liferay theme + maven

I want create liferay theme, so I created a Maven project from archetype. My 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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.liferay.sample</groupId>
<artifactId>sample-theme</artifactId>
<packaging>war</packaging>
<name>sample-theme Theme</name>
<version>0.0.1-SNAPSHOT</version>
<build>
<plugins>
<plugin>
<groupId>com.liferay.maven.plugins</groupId>
<artifactId>liferay-maven-plugin</artifactId>
<version>6.1.20</version>
<executions>
<execution>
<phase>generate-sources</phase>
<goals>
<goal>theme-merge</goal>
<goal>build-css</goal>
<goal>build-thumbnail</goal>
</goals>
</execution>
</executions>
<configuration>
<autoDeployDir>${liferay.auto.deploy.dir}</autoDeployDir>
<appServerDeployDir>${liferay.app.server.deploy.dir}</appServerDeployDir>
<appServerLibGlobalDir>${liferay.app.server.lib.global.dir}</appServerLibGlobalDir>
<appServerPortalDir>${liferay.app.server.portal.dir}</appServerPortalDir>
<liferayVersion>${liferay.version}</liferayVersion>
<parentTheme>${liferay.theme.parent}</parentTheme>
<pluginType>theme</pluginType>
<themeType>${liferay.theme.type}</themeType>
</configuration>
</plugin>
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>2.5</version>
<configuration>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>com.liferay.portal</groupId>
<artifactId>portal-service</artifactId>
<version>6.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.liferay.portal</groupId>
<artifactId>util-bridges</artifactId>
<version>6.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.liferay.portal</groupId>
<artifactId>util-taglib</artifactId>
<version>6.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.liferay.portal</groupId>
<artifactId>util-java</artifactId>
<version>6.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.portlet</groupId>
<artifactId>portlet-api</artifactId>
<version>2.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.4</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
<properties>
<liferay.theme.parent>_styled</liferay.theme.parent>
<liferay.theme.type>vm</liferay.theme.type>
</properties>
</project>And I use maven:package and I see an error:
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building sample-theme Theme 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.400s
[INFO] Finished at: Tue Oct 16 14:47:58 CEST 2012
[INFO] Final Memory: 2M/15M
[INFO] ------------------------------------------------------------------------
[ERROR] Could not find goal 'build-css' in plugin com.liferay.maven.plugins:liferay-maven-plugin:6.1.0 among available goals build-lang, build-wsdd, build-ext, build-service, direct-deploy, theme-merge, build-thumbnail, deploy -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoNotFoundException
What is wrong? I am try change version liferay-maven-plugin but it not resolve my problem.

Use version 6.1.1 as there is no build-css goal in liferay-maven-plugin.jar of 6.1.0 version
Take a look at liferay-maven-plugin.jar/META-INF/maven/plugin.xml for available goals.

You dont have a goal named as 'build-css'
Are you using groovy for your configuration file?
What you have pasted here is only a build file, for Maven's use.
Where are you other goals located, for example, look for "build-thumbnail" and "theme-merge"? Must be in a configuration file that this Maven build file is reading.
Where ever these other goals are, you need to create your goal there, or in a similar file. Then build again.

Remove the entry build-css and build-thumbnail and deploy it again, or you can check the pom.xml file as an reference given in below link.
http://www.liferay.com/community/forums/-/message_boards/message/5220131

As others have written - 6.1.0 doesn't support 'build-css' goal, so you should delete or comment out following line in Your pom.xml:
<goal>build-css</goal>