### Key Architectural Patterns
- **Factory Pattern** - `BeanDescFactory` for creating bean descriptors, `ParameterizedClassDescFactory` for generic type handling
- **Builder Pattern** - `CopyOptions` for configuring bean copying operations with fluent API
- **Adapter Pattern** - Logging adapters (`JclLoggerAdapter`, `JulLoggerAdapter`) for different logging frameworks

    /**
     * Gets a map of filtered environment variables.
     *
     * @param keyPattern The pattern to filter environment variable keys.
     * @return A map of filtered environment variables.
     */
    public Map<String, String> getFilteredEnvMap(final String keyPattern) {
        final Pattern pattern = Pattern.compile(keyPattern);
        return getEnvMap().entrySet().stream().filter(e -> {

        }
        source = source.replaceAll(Pattern.quote("${fess.dictionary.path}"), dictionaryPath)//
                .replaceAll(Pattern.quote("${fess.index.codec}"), fessConfig.getIndexCodec())//
                .replaceAll(Pattern.quote("${fess.index.number_of_shards}"), numberOfShards)//
                .replaceAll(Pattern.quote("${fess.index.auto_expand_replicas}"), autoExpandReplicas);

        } finally {
            if (outputFile.exists()) {
                outputFile.delete();
            }
        }
    }

    // Test concurrent access patterns
    public void test_concurrent_operations() throws Exception {
        final CommandGenerator generator1 = new CommandGenerator();
        final CommandGenerator generator2 = new CommandGenerator();

            <sourceFileExclude>**/ForceGuavaCompilation*</sourceFileExclude>
          </sourceFileExcludes>
          <!-- The above exclusion doesn't actually matter unless I prevent Javadoc from autodiscovering the source in the sourcepath, which defaults to the source directory :\ Boo for -sourcepath. -->
          <sourcepath>doesnotexist</sourcepath>