logger.error("Class not found: " + className, e);
}
```

## 🏗️ Architecture & Design Patterns

### Core Design Principles
CoreLib follows a **utility-class pattern** where most functionality is exposed through static methods:

- **Assertion-based validation** - All methods validate inputs using `AssertionUtil.assertArgumentNotNull()` and `AssertionUtil.assertArgumentNotEmpty()`

        assertEquals(0L, newItem.getId());
    }

    public void test_idFieldAccess() {
        // Test direct field access through inheritance
        TestDictionaryItem item = new TestDictionaryItem();

        // Direct field assignment
        item.id = 999L;

        // Verify through getter
        assertEquals(999L, item.getId());

        // Verify direct field access
        assertEquals(999L, item.id);
    }

### Check the docs UI { #check-the-docs-ui }

But here's the fun part. ✨

The "official" way to access the app would be through the proxy with the path prefix that we defined. So, as we would expect, if you try the docs UI served by Uvicorn directly, without the path prefix in the URL, it won't work, because it expects to be accessed through the proxy.

# Advanced User Guide { #advanced-user-guide }

## Additional Features { #additional-features }

The main [Tutorial - User Guide](../tutorial/index.md){.internal-link target=_blank} should be enough to give you a tour through all the main features of **FastAPI**.

In the next sections you will see other options, configurations, and additional features.

/// tip

The next sections are **not necessarily "advanced"**.

        }
        if (timeoutMillis < 0) {
            throw new IllegalArgumentException("Timeout must be non-negative");
        }
    }

    /**
     * Execute a callable through the circuit breaker
     *
     * @param <T> return type
     * @param callable the callable to execute
     * @return the result
     * @throws Exception if execution fails or circuit is open
     */

 */
package jcifs.internal.smb2.multichannel;

/**
 * Load balancing strategies for multi-channel connections
 */
public enum LoadBalancingStrategy {
    /**
     * Round-robin selection through available channels
     */
    ROUND_ROBIN,

    /**
     * Select the least busy channel based on pending operations
     */
    LEAST_LOADED,

    /**

    test: ["CMD", "mc", "ready", "local"]
    interval: 5s
    timeout: 5s
    retries: 5

# starts 4 docker containers running minio server instances.
# using nginx reverse proxy, load balancing, you can access
# it through port 9000.
services:
  minio1:
    <<: *minio-common
    hostname: minio1
    volumes:
      - data1-1:/data1
      - data1-2:/data2

  minio2:
    <<: *minio-common
    hostname: minio2

	// sets the bucket policy using the policy statement generated from `getReadOnlyBucketStatement` so that the
	// unsigned request goes through and its validated again.
	ExecObjectLayerAPIAnonTest(t, obj, "TestGetBucketLocationHandler", bucketName, "", instanceType, apiRouter, anonReq, getAnonReadOnlyBucketPolicy(bucketName))

            throw new IOException("Connection not established");
        }

        try {
            // For TCP fallback, simulate reading data through the TCP socket
            int bytesToRead = Math.min(length, buffer.remaining());
            ByteBuffer tempBuffer = ByteBuffer.allocate(bytesToRead);

            int totalRead = 0;

If you want to secure your API, there are several better things you can do, for example:

* Make sure you have well defined Pydantic models for your request bodies and responses.