CODEWITHSUNDEEP
javaclassmakefile
Mantas Marcinkus
Mantas Marcinkus

Reputation: 603

Could not find or load main class using makefile

I searched the suggested answers, but i failed to find working answer for me. Makefile compiles everything with any error, but while trying to execute my java program I get error Could not find main class bin.Program.class Even if trying to compile program alone the same error pops out. I have multiple .java files, which has different classes in them and i'm using one library(.jar) file in directory lib/. Without it java compilator gives multiple errors.

SRC = src
LIBDIR = lib
BIN = bin
JAVA_FILES=${wildcard ${SRC}/*.java}
CLASS_FILES=${JAVA_FILES:${SRC}/%.java=${BIN}/%.class}
CLASSPATH="${LIBDIR}/*"
all: run
run: ${CLASS_FILES}
     java ${CLASS_FILES} -cp ${CLASSPATH}
${CLASS_FILES}: ${JAVA_FILES}
     javac $^ -d ${BIN} -cp ${CLASSPATH}

Eclipse compiles and runs program fine, and Program.java has main class.

Upvotes: 1

Views: 1525

Answers (2)

Mantas Marcinkus
Mantas Marcinkus

Reputation: 603

With the answer given, it really helped, and makefile now looks like and it works:

SRC = src
LIBDIR = lib
BIN = bin
JAVA_FILES=${wildcard ${SRC}/*.java}
CLASS_FILES=${JAVA_FILES:${SRC}/%.java=${BIN}/%.class}
CLASSPATH="${LIBDIR}/*"
all: run
run: ${CLASS_FILES}
     java -cp ${BIN}:${LIBDIR}/* Program
${CLASS_FILES}: ${JAVA_FILES}
     javac $^ -d ${BIN} -cp ${CLASSPATH}

Upvotes: 0

Jay Smith
Jay Smith

Reputation: 481

You should be inside of the bin directory and use

java -cp ./ Program

the bin is just a folder, so don't put that in. And Program.class is not the name of the class, Program is.

Upvotes: 2

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