java - Maven build failure -


i'm trying build maven application, error message:

[error] failed execute goal org.apache.maven.plugins:maven-compiler-plugin:2.5.1:compile (default-compile) on project helloworld: compilation failure

[error] d:...\spark-test\java-getting-started\src\main\java\main.java:[73,35] error: lambda expressions not supported in -source 1.5

it's heroku example java project, , in system.properties file java version set: java.runtime.version=1.8

the specific lines these:

get("/login", (request, response) -> {    system.out.println("request: " + request);    return "hello world spark"; });

i don't understand problem, or set source java 1.5

try adding pom.xml:

<plugin>     <groupid>org.apache.maven.plugins</groupid>     <artifactid>maven-compiler-plugin</artifactid>     <version>3.3</version>     <configuration>       <source>1.8</source>       <target>1.8</target>     </configuration>   </plugin>

somehow maven tries compile against java 1.5, did not have lambdas yet (only since 1.8). how starting build? maven command line or ide?


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