18:26:32 [PREPARING] [INFO] Scanning for projects...
18:26:32 [PREPARING] [INFO]
18:26:32 [PREPARING] [INFO] -------------------< prog1:std-interfaces-callback >--------------------
18:26:32 [PREPARING] [INFO] Building std-interfaces-callback 1.0-SNAPSHOT
18:26:32 [PREPARING] [INFO] from pom.xml
18:26:32 [PREPARING] [INFO] --------------------------------[ jar ]---------------------------------
18:26:36 [PREPARING] [INFO]
18:26:36 [PREPARING] [INFO] --- clean:3.2.0:clean (default-clean) @ std-interfaces-callback ---
18:26:36 [PREPARING] [INFO]
18:26:36 [PREPARING] [INFO] --- resources:3.4.0:resources (default-resources) @ std-interfaces-callback ---
18:26:37 [PREPARING] [INFO] Copying 4 resources from src/main/resources to target/classes
18:26:37 [PREPARING] [INFO]
18:26:37 [PREPARING] [INFO] --- compiler:3.15.0:compile (default-compile) @ std-interfaces-callback ---
18:26:38 [PREPARING] [INFO] Recompiling the module because of changed source code.
18:26:38 [PREPARING] [INFO] Compiling 23 source files with javac [debug release 25] to target/classes
18:26:39 [PREPARING] [INFO] -------------------------------------------------------------
18:26:39 [PREPARING] [ERROR] COMPILATION ERROR :
18:26:39 [PREPARING] [INFO] -------------------------------------------------------------
18:26:39 [PREPARING] [ERROR] /git_2744309914710746360/src/main/java/ch/fhnw/prog1/exercise/todo/ToDoApp.java:[77,25] method isEmpty in class java.util.TreeSet<E> cannot be applied to given types;
18:26:39 [PREPARING] required: no arguments
18:26:39 [PREPARING] found: int
18:26:39 [PREPARING] reason: actual and formal argument lists differ in length
18:26:39 [PREPARING] [ERROR] /git_2744309914710746360/src/main/java/ch/fhnw/prog1/exercise/todo/ToDoApp.java:[79,26] cannot find symbol
18:26:39 [PREPARING] symbol: method set(int,ch.fhnw.prog1.exercise.todo.Task)
18:26:39 [PREPARING] location: variable tasks of type java.util.TreeSet<ch.fhnw.prog1.exercise.todo.Task>
18:26:39 [PREPARING] [ERROR] /git_2744309914710746360/src/main/java/ch/fhnw/prog1/exercise/todo/ToDoApp.java:[96,30] cannot find symbol
18:26:39 [PREPARING] symbol: method get(int)
18:26:39 [PREPARING] location: variable tasks of type java.util.TreeSet<ch.fhnw.prog1.exercise.todo.Task>
18:26:39 [PREPARING] [ERROR] /git_2744309914710746360/src/main/java/ch/fhnw/prog1/exercise/todo/ToDoApp.java:[97,21] cannot find symbol
18:26:39 [PREPARING] symbol: method get(int)
18:26:39 [PREPARING] location: variable tasks of type java.util.TreeSet<ch.fhnw.prog1.exercise.todo.Task>
18:26:39 [PREPARING] [ERROR] /git_2744309914710746360/src/main/java/ch/fhnw/prog1/exercise/todo/ToDoApp.java:[118,26] cannot find symbol
18:26:39 [PREPARING] symbol: method get(int)
18:26:39 [PREPARING] location: variable tasks of type java.util.TreeSet<ch.fhnw.prog1.exercise.todo.Task>
18:26:39 [PREPARING] [ERROR] /git_2744309914710746360/src/main/java/ch/fhnw/prog1/exercise/todo/ToDoApp.java:[119,17] cannot find symbol
18:26:39 [PREPARING] symbol: method get(int)
18:26:39 [PREPARING] location: variable tasks of type java.util.TreeSet<ch.fhnw.prog1.exercise.todo.Task>
18:26:39 [PREPARING] [INFO] 6 errors
18:26:39 [PREPARING] [INFO] -------------------------------------------------------------
18:26:39 [PREPARING] [INFO] ------------------------------------------------------------------------
18:26:39 [PREPARING] [INFO] BUILD FAILURE
18:26:39 [PREPARING] [INFO] ------------------------------------------------------------------------
18:26:39 [PREPARING] [INFO] Total time: 7.369 s
18:26:39 [PREPARING] [INFO] Finished at: 2026-05-17T18:26:39Z
18:26:39 [PREPARING] [INFO] ------------------------------------------------------------------------
18:26:39 [PREPARING] [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.15.0:compile (default-compile) on project std-interfaces-callback: Compilation failure: Compilation failure:
18:26:39 [PREPARING] [ERROR] /git_2744309914710746360/src/main/java/ch/fhnw/prog1/exercise/todo/ToDoApp.java:[77,25] method isEmpty in class java.util.TreeSet<E> cannot be applied to given types;
18:26:39 [PREPARING] [ERROR] required: no arguments
18:26:39 [PREPARING] [ERROR] found: int
18:26:39 [PREPARING] [ERROR] reason: actual and formal argument lists differ in length
18:26:39 [PREPARING] [ERROR] /git_2744309914710746360/src/main/java/ch/fhnw/prog1/exercise/todo/ToDoApp.java:[79,26] cannot find symbol
18:26:39 [PREPARING] [ERROR] symbol: method set(int,ch.fhnw.prog1.exercise.todo.Task)
18:26:39 [PREPARING] [ERROR] location: variable tasks of type java.util.TreeSet<ch.fhnw.prog1.exercise.todo.Task>
18:26:39 [PREPARING] [ERROR] /git_2744309914710746360/src/main/java/ch/fhnw/prog1/exercise/todo/ToDoApp.java:[96,30] cannot find symbol
18:26:39 [PREPARING] [ERROR] symbol: method get(int)
18:26:39 [PREPARING] [ERROR] location: variable tasks of type java.util.TreeSet<ch.fhnw.prog1.exercise.todo.Task>
18:26:39 [PREPARING] [ERROR] /git_2744309914710746360/src/main/java/ch/fhnw/prog1/exercise/todo/ToDoApp.java:[97,21] cannot find symbol
18:26:39 [PREPARING] [ERROR] symbol: method get(int)
18:26:39 [PREPARING] [ERROR] location: variable tasks of type java.util.TreeSet<ch.fhnw.prog1.exercise.todo.Task>
18:26:39 [PREPARING] [ERROR] /git_2744309914710746360/src/main/java/ch/fhnw/prog1/exercise/todo/ToDoApp.java:[118,26] cannot find symbol
18:26:39 [PREPARING] [ERROR] symbol: method get(int)
18:26:39 [PREPARING] [ERROR] location: variable tasks of type java.util.TreeSet<ch.fhnw.prog1.exercise.todo.Task>
18:26:39 [PREPARING] [ERROR] /git_2744309914710746360/src/main/java/ch/fhnw/prog1/exercise/todo/ToDoApp.java:[119,17] cannot find symbol
18:26:39 [PREPARING] [ERROR] symbol: method get(int)
18:26:39 [PREPARING] [ERROR] location: variable tasks of type java.util.TreeSet<ch.fhnw.prog1.exercise.todo.Task>
18:26:39 [PREPARING] [ERROR] -> [Help 1]
18:26:39 [PREPARING] [ERROR]
18:26:39 [PREPARING] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
18:26:39 [PREPARING] [ERROR] Re-run Maven using the -X switch to enable full debug logging.
18:26:39 [PREPARING] [ERROR]
18:26:39 [PREPARING] [ERROR] For more information about the errors and possible solutions, please read the following articles:
18:26:39 [PREPARING] [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
18:26:39 [PREPARING] Failed to build student submission
18:26:39 [PREPARING] HINT: ensure your code can be compiled locally before running AutoFeedback evaluation