return System.getProperty(key);
    }

    /**
     * Returns the system property value for the specified key, or the default value if not found.
     *
     * @param key the property key
     * @param defaultValue the default value
     * @return the property value, or the default value if not found
     */
    public static String getProperty(String key, String defaultValue) {

		if legacy {
			// ram_per_request is (1MiB+32KiB) * driveCount \
			//    + 2 * 10MiB (default erasure block size v1) + 2 * 1MiB (default erasure block size v2)
			apiRequestsMaxPerNode = int(maxMem / uint64(maxSetDrives*blockSize+int(blockSizeV1*2+blockSizeV2*2)))
		} else {
			// ram_per_request is (1MiB+32KiB) * driveCount \
			//    + 2 * 1MiB (default erasure block size v2)

        disableRoleQuery = true;
    }

    /**
     * Gets the default field for this query context.
     * @return The default field name, or null if not set.
     */
    public String getDefaultField() {
        return defaultField;
    }

    /**
     * Sets the default field for this query context.
     * @param defaultField The default field name to set.
     */

ff;background-color:#28a745;border-color:#23923d}.alert-default-success{color:#155724;background-color:#d4edda;border-color:#c3e6cb}.alert-default-success hr{border-top-color:#b1dfbb}.alert-default-success .alert-link{color:#0b2e13}.alert-info{color:#fff;background-color:#17a2b8;border-color:#148ea1}.alert-default-info{color:#0c5460;background-color:#d1ecf1;border-color:#bee5eb}.alert-default-info hr{border-top-color:#abdde5}.alert-default-info .alert-link{color:#062c33}.alert-warning{color:#1f2...

    @Test
    @DisplayName("Should create SpnegoException with default constructor")
    void testDefaultConstructor() {
        // When
        SpnegoException ex = new SpnegoException();

        // Then
        assertNotNull(ex, "Exception should be created");
        assertNull(ex.getMessage(), "Default message should be null");
        assertNull(ex.getCause(), "Default cause should be null");

    /** @deprecated use lifecycles instead */
    @Deprecated
    private Map<String, LifecyclePhase> phases;

    /**
     * Default ctor for plexus compatibility: lifecycles are most commonly defined in Plexus XML, that does field
     * injection. Still, for Plexus to be able to instantiate this class, default ctor is needed.
     *
     * @deprecated Should not be used in Java code.
     */
    @Deprecated

            assertEquals("application/octet-stream", mimeMap.getMimeType("test123abc"));
        }
    }

    @Nested
    @DisplayName("getMimeType with custom default")
    class GetMimeTypeWithDefault {

        @Test
        @DisplayName("Should return custom default for unknown extensions")
        void testCustomDefaultForUnknown() throws IOException {
            String customDefault = "application/custom";

    /**
     * Retrieve a <code>String</code>. If the key cannot be found,
     * the provided <code>def</code> default parameter will be returned.
     *
     * @param key the property key to look up
     * @param def the default value to return if the property is not found
     * @return the property value, or the default value if not found
     */

    public static String getProperty(final String key, final String def) {

            throw new IORuntimeException(ex);
        }
    }

    /**
     * Converts a byte array to an object using the default security filter.
     * <p>
     * This method applies a default ObjectInputFilter to prevent deserialization attacks.
     * Only classes matching the default allowed patterns can be deserialized.
     * </p>
     *
     * @param bytes the byte array (must not be {@literal null})

Like `item.model_dump(exclude_unset=True)`.

That would generate a `dict` with only the data that was set when creating the `item` model, excluding default values.

Then you can use this to generate a `dict` with only the data that was set (sent in the request), omitting default values:

{* ../../docs_src/body_updates/tutorial002_py310.py hl[32] *}

### Using Pydantic's `update` parameter { #using-pydantics-update-parameter }