fix: Support reading liquibase.classpath from properties file (liquibase#7394)

Fixes liquibase#6194

The classpath property was being ignored when specified in
liquibase.properties after version 4.19.0, causing "Cannot find
database driver" errors.

Root cause: The regex pattern in ParameterUtil only matched the
short form "classpath" but not the official configuration key
"liquibase.classpath".

Changes:
- Modified ParameterUtil.getPropertyFromInputStream() to match both
  "classpath" and "liquibase.classpath" property keys
- Added comprehensive unit tests covering both property formats,
  command line parsing, and edge cases

This maintains backward compatibility while fixing the issue where
users had to use --classpath on command line as a workaround.

Author: filipelautert

liquibase-cli/src/main/java/liquibase/integration/commandline/util/ParameterUtil.java

@@ -81,8 +81,10 @@ private static String getPropertyFromInputStream(String cmd, InputStream default
         if (defaultsStream != null) {
             Properties properties = new Properties();
             properties.load(defaultsStream);
+            // Match both "key" and "liquibase.key" forms (e.g., "classpath" and "liquibase.classpath")
+            String pattern = "(liquibase\\.)?" + cmd;
             Optional<Map.Entry<Object, Object>> property = properties.entrySet().stream()
-                    .filter(entry -> entry.getKey().toString().matches(cmd))
+                    .filter(entry -> entry.getKey().toString().matches(pattern))
                     .findFirst();
             if (property.isPresent()) {
                 return property.get().getValue().toString();

liquibase-cli/src/test/java/liquibase/integration/commandline/util/ParameterUtilTest.java

@@ -0,0 +1,82 @@
+package liquibase.integration.commandline.util;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.nio.file.Path;
+
+import static liquibase.util.LiquibaseLauncherSettings.LiquibaseLauncherSetting.LIQUIBASE_CLASSPATH;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+/**
+ * Tests for ParameterUtil, specifically for reading parameters from properties files.
+ */
+public class ParameterUtilTest {
+
+    @Test
+    public void testGetParameter_classpathFromPropertiesFile_shortForm(@TempDir Path tempDir) throws IOException {
+        // Create a temporary properties file with "classpath" (short form)
+        File propertiesFile = tempDir.resolve("liquibase.properties").toFile();
+        try (FileWriter writer = new FileWriter(propertiesFile)) {
+            writer.write("classpath=../drivers/mssql-jdbc-12.6.1.jre11.jar;./liquibase/db-migration.jar\n");
+        }
+
+        String[] args = {"--defaults-file=" + propertiesFile.getAbsolutePath()};
+
+        String result = ParameterUtil.getParameter(LIQUIBASE_CLASSPATH, "classpath", args, true);
+
+        assertEquals("../drivers/mssql-jdbc-12.6.1.jre11.jar;./liquibase/db-migration.jar", result);
+    }
+
+    @Test
+    public void testGetParameter_classpathFromPropertiesFile_longForm(@TempDir Path tempDir) throws IOException {
+        // Create a temporary properties file with "liquibase.classpath" (long form)
+        File propertiesFile = tempDir.resolve("liquibase.properties").toFile();
+        try (FileWriter writer = new FileWriter(propertiesFile)) {
+            writer.write("liquibase.classpath=../drivers/mssql-jdbc-12.6.1.jre11.jar;./liquibase/db-migration.jar\n");
+        }
+
+        String[] args = {"--defaults-file=" + propertiesFile.getAbsolutePath()};
+
+        String result = ParameterUtil.getParameter(LIQUIBASE_CLASSPATH, "classpath", args, true);
+
+        assertEquals("../drivers/mssql-jdbc-12.6.1.jre11.jar;./liquibase/db-migration.jar", result);
+    }
+
+    @Test
+    public void testGetParameter_classpathFromPropertiesFile_notPresent(@TempDir Path tempDir) throws IOException {
+        // Create a temporary properties file without classpath
+        File propertiesFile = tempDir.resolve("liquibase.properties").toFile();
+        try (FileWriter writer = new FileWriter(propertiesFile)) {
+            writer.write("driver=com.microsoft.sqlserver.jdbc.SQLServerDriver\n");
+        }
+
+        String[] args = {"--defaults-file=" + propertiesFile.getAbsolutePath()};
+
+        String result = ParameterUtil.getParameter(LIQUIBASE_CLASSPATH, "classpath", args, true);
+
+        assertNull(result);
+    }
+
+    @Test
+    public void testGetParameter_classpathFromCommandLine() throws IOException {
+        String[] args = {"--classpath=../drivers/test.jar"};
+
+        String result = ParameterUtil.getParameter(LIQUIBASE_CLASSPATH, "classpath", args, false);
+
+        assertEquals("../drivers/test.jar", result);
+    }
+
+    @Test
+    public void testGetParameter_classpathFromCommandLine_withSpace() throws IOException {
+        String[] args = {"--classpath", "../drivers/test.jar"};
+
+        String result = ParameterUtil.getParameter(LIQUIBASE_CLASSPATH, "classpath", args, false);
+
+        assertEquals("../drivers/test.jar", result);
+    }
+}