Build fails with javadoc error on JDK 1.7 about flink-training-exercises HOT 5 CLOSED

You can temporarily circumvent this by doing mvn clean install -Dmaven.javadoc.skip=true

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I have this problem too.but i use this command:mvn -Dmaven.skip=ture verify.I dont know is this right,Can anybody help me?

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The project seems to not be set up for Java 7. Because Java broke the JavaDoc tool behavior between Java 7 and Java 8, this needs the following changes:

1. Remove the <additionalparam>-Xdoclint:none</additionalparam> from the javadoc section.

2. Add a Java 8 profile that activates that parameter only when Java 8 is used:

		<profile>
			<id>jdk8</id>
			<activation>
				<activeByDefault>false</activeByDefault>
				<jdk>1.8</jdk>
			</activation>
			<build>
				<plugins>
					<plugin>
						<groupId>org.apache.maven.plugins</groupId>
						<artifactId>maven-javadoc-plugin</artifactId>
						<version>2.9.1</version>
						<configuration>
							<quiet>true</quiet>
						</configuration>
						<executions>
							<execution>
								<id>attach-javadocs</id>
								<goals>
									<goal>jar</goal>
								</goals>
								<configuration>
									<additionalparam>-Xdoclint:none</additionalparam>
									<detectOfflineLinks>false</detectOfflineLinks>
								</configuration>
							</execution>
						</executions>
					</plugin>
				</plugins>
			</build>
		</profile>

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mvn clean install -Dmaven.javadoc.skip=true this worked,but i have not test the other method.

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Couldn't reproduce this with either openjdk version 1.7.0_141 or oracle java 1.7.0_79-b15, so this only affects some java 7 environments.

As Flink 1.4 is coming soon and will drop support for java 7, it's not worth fixing this now.

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