The readObject method of _DynAnyFactoryStub has been amended, such that, when reading the stringified IOR from serialized data, it will, by default, accept stringified IORs in IOR: URI format, only. As DynAnyFactory is a locally or ORB constrained type, it is not useful that serialized data should contain corbaname or corbaloc URIs. Furthermore, an ORB will prohibit the binding of a name in the INS to a DynAnyFactory IOR, as such, using a corbaname to reference an instance of DynAnyFactory is not meaningful.
java.util.Vector is updated to correctly report ClassNotFoundException that occurs during deserialization using java.io.ObjectInputStream.GetField.get(name, object) when the class of an element of the Vector is not found. Without this fix, a StreamCorruptedException is thrown that does not provide information about the missing class.
Allow applications to configure context-specific and dynamically-selected deserialization filters via a JVM-wide filter factory that is invoked to select a filter for each deserialization stream. The behavior is a strict subset of JEP 415: Context-Specific Deserialization Filters to allow a filter factory to be configured using a property configured on the command line or in the security properties file.
The behavior is opt-in based on the presence of the jdk.serialFilterFactory system property on the command line or the jdk.serialFilterFactory security property. If set, the JVM-wide filter factory selects the filter for each stream when the stream is constructed and when a stream-specific filter is set.
The scope of the com.sun.jndi.ldap.object.trustSerialData system property has been extended to control the deserialization of java objects from the javaReferenceAddress LDAP attribute. This system property now controls the deserialization of java objects from the javaSerializedData and javaReferenceAddress LDAP attributes.
To prevent deserialization of java objects from these attributes, the system property can be set to false. By default, the deserialization of java objects from javaSerializedData and javaReferenceAddress attributes is allowed.
jdk.jndi.object.factoriesFilter: This system and security property allows a serial filter to be specified that controls the set of object factory classes permitted to instantiate objects from object references returned by naming/directory systems. The factory class named by the reference instance is matched against this filter during remote reference reconstruction. The filter property supports pattern-based filter syntax with the format specified by JEP 290. This property applies both to the JNDI/RMI and the JNDI/LDAP built-in provider implementations. The default value allows any object factory class specified in the reference to recreate the referenced object.
com.sun.jndi.ldap.object.trustSerialData: This system property allows control of the deserialization of java objects from the javaSerializedData LDAP attribute. To prevent deserialization of java objects from the attribute, the system property can be set to false value. By default, deserialization of java objects from the javaSerializedData attribute is allowed.
The deserialization of java.lang.reflect.Proxy objects can be limited by setting the system property jdk.serialProxyInterfaceLimit.The limit is the maximum number of interfaces allowed per Proxy in the stream.Setting the limit to zero prevents any Proxies from being deserialized including Annotations, a limit of less than 2 might interfere with RMI operations.
When setting a serialization filter by using java.io.ObjectInputStream.setObjectInputFilter the method must be called before reading any objects from the stream. If the methods readObject or readUnshared are called, the setObjectInputFilter method throws IllegalStateException.
The jdk.serialFilter system property can only be set on the command line. If the filter has not been set on the command line, it can be set can be set with java.io.ObjectInputFilter.Config.setSerialFilter. Setting the jdk.serialFilter with java.lang.System.setProperty has no effect.
New access checks have been added during the object creation phase of deserialization. This should not affect ordinary uses of deserialization. However, reflective frameworks that make use of JDK-internal APIs may be impacted. The new checks can be disabled if necessary by setting the system property jdk.disableSerialConstructorChecks to the value "true". This must be done by adding the argument -Djdk.disableSerialConstructorChecks=true to the Java command line.
A new security property named jceks.key.serialFilter has been introduced. If this filter is configured, the JCEKS KeyStore uses it during the deserialization of the encrypted Key object stored inside a SecretKeyEntry. If it is not configured or if the filter result is UNDECIDED (for example, none of the patterns match), then the filter configured by jdk.serialFilter is consulted.
The filter pattern uses the same format as jdk.serialFilter. The default pattern allows java.lang.Enum, java.security.KeyRep, java.security.KeyRep$Type, and javax.crypto.spec.SecretKeySpec but rejects all the others.
The RMI Registry built-in serial filter has been modified to check only the array size and not the component type. The maximum array size has been increased to 1,000,000. The override filter can be used to decrease the limit. Array sizes greater than the maxarray limit will be rejected. Sizes less than the maxarray limit will be allowed.
The RMI Registry built-in serial filter is modified to check only the array size and not the component type. The maximum array size is increased to 1,000,000. The override filter can be used to decrease the limit. Array sizes greater than the maxarray limit will be rejected and otherwise will be allowed. The java.security file contains more information about the sun.rmi.registry.registryFilter property and it will be updated in the conf/security/java.security configuration file to better describe the default behavior and how to override it.
New public attributes, RMIConnectorServer.CREDENTIALS_FILTER_PATTERN and RMIConnectorServer.SERIAL_FILTER_PATTERN have been added to RMIConnectorServer.java. With these new attributes, users can specify the deserialization filter pattern strings to be used while making a RMIServer.newClient() remote call and while sending deserializing parameters over RMI to server respectively.
Deserialization of certain collection instances will cause arrays to be allocated. The ObjectInputFilter.checkInput() method is now called prior to allocation of these arrays. Deserializing instances of ArrayDeque, ArrayList, IdentityHashMap, PriorityQueue, java.util.concurrent.CopyOnWriteArrayList, and the immutable collections (as returned by List.of, Set.of, and Map.of) will call checkInput() with a FilterInfo instance whose style="font-family: Courier New;">serialClass() method returns Object.class. Deserializing instances of HashMap, HashSet, Hashtable, and Properties will call checkInput() with a FilterInfo instance whose serialClass() method returns Map.Entry.class. In both cases, the FilterInfo.arrayLength() method will return the actual length of the array to be allocated. The exact circumstances under which the serialization filter is called, and with what information, is subject to change in future releases.
If a Class D audio amp driver is used, designers should also consider using I2S instead of analog or PWM outputs. I2S is a digital audio standard for input or output. Both stereo and mono modes are supported at different frequencies. Many new Class D audio amps have I2S digital audio inputs. The audio sample values are shifted out using a digital I/O pin and two clocks. LRCLK is the left/right channel select for stereo, and BCLK is the bit clock for serial data, DIN. Digital outputs provide greater noise immunity and most chips also have digital low-pass anti-aliasing filters, so higher quality audio is possible. Many processor chips such as the mbed LPC1768 have an I2S hardware controller. I2S is not one of the standard mbed APIs yet, but there are mbed I2S libraries available.
The final approach is to add an advanced audio IC with an internal microcontroler with firmware such as an MP3/WAV player chip. Recently, some very low cost MP3 player modules have been introduced. They have been used in Arduino projects so they are widely available from several sources and have even been cloned with a few different parts on the module.The DFPlayer mini modules are available for under $3 from some places like Amazon or Alibaba. It plays the common sound file formats including MP3 at up to 44Khz with a 24bit DAC and even contains a 3W driver for a speaker with stereo outputs for headphones. They have a uSD card slot on the board for music files or it can read a USB flash drive. Audio file names will require a three digit numeric prefix, 00x*.* . There are also a bit larger versions of the module with a headphone jack, but no audio amp. It needs a serial port for control running at 9600 baud or pushbuttons. There is an mbed driver library available at: and there is a datasheet available and there is another more complete datasheet. As seen in the image above, the DFPlayer module contains a small audio amp IC (left) and an YX5200-24SS MP3 chip(right).
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