Make jpype optional

README.md

@@ -35,6 +35,12 @@ Ensure you have a Java runtime and set the PATH for it.
 pip install tabula-py
 ```
 
+If you want to leverage faster execution with jpype, install with `jpype` extra.
+
+```sh
+pip install tabula-py[jpype]
+```
+
 ### Example
 
 tabula-py enables you to extract tables from a PDF into a DataFrame, or a JSON. It can also extract tables from a PDF and save the file as a CSV, a TSV, or a JSON.  

noxfile.py

@@ -20,8 +20,30 @@ def lint(session):
 
 
 @nox.session
-def tests(session):
+@nox.parametrize(
+    "python,jpype",
+    [
+        ("3.8", True),
+        ("3.9", True),
+        ("3.10", True),
+        ("3.11", True),
+        #("3.12", False),
+    ],
+)
+def tests(session, jpype):
+    if jpype:
+        tests_with_jpype(session)
+    else:
+        tests_without_jpype(session)
+
+
+def tests_without_jpype(session):
     session.install(".[test]")
     session.run("pytest", "-v", "tests/test_read_pdf_table.py")
+
+
+def tests_with_jpype(session):
+    session.install(".[jpype,test]")
+    session.run("pytest", "-v", "tests/test_read_pdf_table.py")
     session.run("pytest", "-v", "tests/test_read_pdf_jar_path.py")
     session.run("pytest", "-v", "tests/test_read_pdf_silent.py")

pyproject.toml

@@ -32,11 +32,11 @@ dependencies = [
   "pandas >= 0.25.3",
   "numpy",
   "distro",
-  "jpype1",
 ]
 dynamic = ["version"]
 
 [project.optional-dependencies]
+jpype = ["jpype1"]
 dev = [
   "pytest",
   "flake8",

tabula/backend.py

@@ -3,9 +3,6 @@
 from logging import getLogger
 from typing import List, Optional
 
-import jpype
-import jpype.imports
-
 from .errors import JavaNotFoundError
 from .util import TabulaOption
 
@@ -27,35 +24,38 @@ def jar_path() -> str:
 
 class TabulaVm:
     def __init__(self, java_options: List[str], silent: Optional[bool]) -> None:
-        if not jpype.isJVMStarted():
-            jpype.addClassPath(jar_path())
-
-            # Workaround to enforce the silent option. See:
-            # https://github.com/tabulapdf/tabula-java/issues/231#issuecomment-397281157
-            if silent:
-                java_options.extend(
-                    (
-                        "-Dorg.slf4j.simpleLogger.defaultLogLevel=off",
-                        "-Dorg.apache.commons.logging.Log"
-                        "=org.apache.commons.logging.impl.NoOpLog",
+        try:
+            import jpype
+            import jpype.imports
+
+            if not jpype.isJVMStarted():
+                jpype.addClassPath(jar_path())
+
+                # Workaround to enforce the silent option. See:
+                # https://github.com/tabulapdf/tabula-java/issues/231#issuecomment-397281157
+                if silent:
+                    java_options.extend(
+                        (
+                            "-Dorg.slf4j.simpleLogger.defaultLogLevel=off",
+                            "-Dorg.apache.commons.logging.Log"
+                            "=org.apache.commons.logging.impl.NoOpLog",
+                        )
                     )
-                )
 
-            jpype.startJVM(*java_options, convertStrings=False)
+                jpype.startJVM(*java_options, convertStrings=False)
 
-        try:
             import java.lang as lang
             import technology.tabula as tabula
             from org.apache.commons.cli import DefaultParser
 
             self.tabula = tabula
             self.parser = DefaultParser()
             self.lang = lang
+
         except (ModuleNotFoundError, ImportError) as e:
             logger.warning(
                 "Error importing jpype dependencies. Fallback to subprocess."
             )
-            logger.warning(jpype.java.lang.System.getProperty("java.class.path"))
             logger.warning(e)
             self.tabula = None
             self.parse = None

tests/test_read_pdf_jar_path.py

@@ -3,6 +3,7 @@
 from subprocess import CalledProcessError
 from unittest.mock import patch
 
+import jpype
 import pytest
 
 import tabula
@@ -19,5 +20,5 @@ def test_read_pdf_with_jar_path(self, jar_func):
         # Fallback to subprocess
         with pytest.raises(CalledProcessError):
             tabula.read_pdf(self.pdf_path, encoding="utf-8")
-        file_name = Path(tabula.backend.jpype.getClassPath()).name
+        file_name = Path(jpype.getClassPath()).name
         self.assertEqual(file_name, "tabula-java.jar")

tests/test_read_pdf_silent.py

@@ -2,19 +2,16 @@
 import unittest
 from unittest.mock import patch
 
-import pytest
-
 import tabula
 
 
 class TestReadPdfJarPath(unittest.TestCase):
     def setUp(self):
         self.pdf_path = "tests/resources/data.pdf"
 
-    @patch("tabula.backend.jpype.startJVM")
+    @patch("jpype.startJVM")
     def test_read_pdf_with_silent_true(self, jvm_func):
-        with pytest.raises(RuntimeError):
-            tabula.read_pdf(self.pdf_path, encoding="utf-8", silent=True)
+        tabula.read_pdf(self.pdf_path, encoding="utf-8", silent=True)
 
         target_args = []
         if platform.system() == "Darwin":