Compilation error when using Streams and Maven
I got a weird compilation error when trying to compile my code with Maven , my code is running inside Eclipse, I am using Java 8 and Files.lines
for read the file.
[INFO] Compiling 8 source files to /Users/nilemarbarcelos/Dev/ConferenceTrackManager/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /Users/nilemarbarcelos/Dev/ConferenceTrackManager/src/main/java/com/nilemarbarcelos/FileInputHandler.java:[29,69] incompatible types: java.util.List<java.lang.Object> cannot be converted to java.util.List<java.lang.String>
[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.122 s
[INFO] Finished at: 2015-05-03T14:26:41-03:00
[INFO] Final Memory: 14M/211M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project ConferenceTrackManager: Compilation failure
[ERROR] /Users/nilemarbarcelos/Dev/ConferenceTrackManager/src/main/java/com/nilemarbarcelos/FileInputHandler.java:[29,69] incompatible types: java.util.List<java.lang.Object> cannot be converted to java.util.List<java.lang.String>
[ERROR] -> [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/MojoFailureException
The code looks like this:
List<String> lines = null;
try {
URL path = getClass().getClassLoader().getResource(source);
if (Objects.isNull(path)) {
throw new FileNotFoundException("File not found");
}
lines = Files.lines(Paths.get(path.toURI())).collect(Collectors.toList());
Where I am using the method collect()
.
Can anyone help me solve this error?
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2 answers
You don't have a POM here, but you probably didn't specify the JDK :
<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>
Once you've added this to <plugins>
your POM section and executed mvn clean install
, the error should resolve on its own.
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