added makefile that can compile all .java files and maintain the package structure

Test.java

@@ -0,0 +1,2 @@
+public class Test {
+}

makefile

@@ -0,0 +1,33 @@
+JFLAGS = -g
+JC = javac
+
+SRCDIR = src/main/java
+DESTDIR = out
+
+# Use find to locate all .java files recursively
+SOURCES := $(shell find $(SRCDIR) -name '*.java')
+RELATIVE_SOURCES := $(patsubst $(SRCDIR)/%,%,$(SOURCES))
+
+# Convert .java files to .class files with the same directory structure
+CLASSES := $(patsubst $(SRCDIR)/%.java,$(DESTDIR)/%.class,$(SOURCES))
+
+# Create a list of directories that need to be created in the destination directory
+DIRS := $(sort $(dir $(CLASSES)))
+
+all:
+	@echo "$(RELATIVE_SOURCES)"
+
+default: classes
+
+# Rule for creating directories
+$(DIRS):
+	@mkdir -p $@
+
+# Rule for compiling Java files
+$(DESTDIR)/%.class: $(SRCDIR)/%.java | $(DIRS)
+	$(JC) -nowarn -d $(DESTDIR) -cp "src/main/java:target/dependencies/*" $(JFLAGS) $<
+
+classes: $(CLASSES)
+
+clean:
+	$(RM) -r $(DESTDIR)

pom.xml

@@ -48,6 +48,23 @@ http://maven.apache.org/maven-v4_0_0.xsd">
 
 	<build>
 		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-dependency-plugin</artifactId>
+				<version>3.1.2</version>
+				<executions>
+					<execution>
+						<id>copy-dependencies</id>
+						<phase>package</phase>
+						<goals>
+							<goal>copy-dependencies</goal>
+						</goals>
+						<configuration>
+							<outputDirectory>${project.build.directory}/dependencies</outputDirectory>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-compiler-plugin</artifactId>
@@ -73,6 +90,9 @@ http://maven.apache.org/maven-v4_0_0.xsd">
 				<groupId>org.antlr</groupId>
 				<artifactId>antlr4-maven-plugin</artifactId>
 				<version>4.11.1</version>
+				<configuration>
+					<outputDirectory>${project.basedir}/src/main/java</outputDirectory>
+				</configuration>
 				<executions>
 					<execution>
 						<id>antlr</id>