JPype1

import jpype
import jpype.imports
from jpype.types import *
import os

# Ensure JAVA_HOME is set or provide jvmpath directly
# Example: jvmpath = jpype.getDefaultJVMPath() (only works if JAVA_HOME is configured)
# Or, set it manually (e.g., for Windows: C:\Program Files\Java\jdk-11\bin\server\jvm.dll)
# For Linux/macOS: /usr/lib/jvm/java-11-openjdk/lib/server/libjvm.so or similar
# For robust execution, ensure JAVA_HOME is set in your environment variables.
java_home = os.environ.get('JAVA_HOME', '')
if not java_home:
    print("Warning: JAVA_HOME environment variable is not set. JPype might not find the JVM.")
    print("Please set JAVA_HOME to your JDK/JRE installation path.")
    # Attempt to start without explicit path if JAVA_HOME is missing, might fail
    jvm_args = []
else:
    print(f"Using JAVA_HOME: {java_home}")
    # On some systems, getDefaultJVMPath might still require the full path to libjvm.so/jvm.dll
    # For simplicity in quickstart, relying on JAVA_HOME or system default
    jvm_args = [] # JPype often infers path if JAVA_HOME is set

# Start the JVM with a minimal classpath
try:
    # Using a dummy classpath for demonstration; replace with actual JARs if needed.
    # For this simple example, no specific JARs are required beyond standard Java libraries.
    jpype.startJVM(jpype.getDefaultJVMPath(), *jvm_args, classpath=[os.environ.get('CLASSPATH', '')])
    
    # Import a Java class
    from java.lang import System, String

    # Use Java objects and methods
    java_string = String("Hello from Java!")
    System.out.println(java_string)

    # Accessing Java static fields or methods
    print(f"Java Version: {System.getProperty('java.version')}")

except Exception as e:
    print(f"Failed to start JVM or execute Java code: {e}")
finally:
    # Shutdown the JVM
    if jpype.isJVMStarted():
        jpype.shutdownJVM()
        print("JVM shutdown.")