Check Java Object Serialization Compatibility

Find. Bugs Bug Descriptions. This document lists the standard bug patterns reported by. Find. Bugs version 3. This article describes Trove library set of primitive value collections for Java as well as migration from JDK to Trove collections. This FAQ covers some questions Ive been asked after talking about Java deserialization security at conferences during the last months. This document is the API specification for the Java Platform, Standard Edition. The docs for java. Serializable are probably about as good an explanation as youll get The serialization runtime associates with each serializable class a version. Summary. Description. Category. BC Equals method should not assume anything about the type of its argument. Bad practice. BIT Check for sign of bitwise operation. Bad practice. CN Class implements Cloneable but does not define or use clone method. Bad practice. CN clone method does not call super. Bad practice. CN Class defines clone but doesnt implement Cloneable. B-tAXJOsPZu3XYbe6cG8jRbx_Df5-UPBdZeTSevAnIETa8wIqQWoFhI5vcaJ-IIWrxqho84FYRnGTGPBGJOsiKNJJsc9a60WzeU_qJj_6w=w1200-h630-p-k-no-nu' alt='Check Java Object Serialization Compatibility' title='Check Java Object Serialization Compatibility' />Bad practice. CNT Rough value of known constant found. Bad practice. Co Abstract class defines covariant compare. Realm Java is the first database built for mobile. An alternative to SQLite and ORMs thats fast, easy to use, and open source. The Java Certification Path API consists of classes and interfaces for handling certification paths also known as certificate chains. A certification path is an. To method. Bad practice. Co compare. Tocompare incorrectly handles float or double value. Bad practice. Co compare. Tocompare returns Integer. MINVALUEBad practice. Co Covariant compare. To method defined. Bad practice. DE Method might drop exception. Bad practice. DE Method might ignore exception. Bad practice. DMI Adding elements of an entry set may fail due to reuse of Entry objects. Bad practice. DMI Random object created and used only once. Bad practice. DMI Dont use remove. All to clear a collection. Bad practice. Dm Method invokes System. Bad practice. Dm Method invokes dangerous method run. Finalizers. On. Exit. Bad practice. ES Comparison of String parameter using or Bad practice. ES Comparison of String objects using or Bad practice. Eq Abstract class defines covariant equals method. Bad practice. Eq Equals checks for incompatible operand. Bad practice. Eq Class defines compare. To. and uses Object. Bad practice. Eq equals method fails for subtypes. Bad practice. Eq Covariant equals method defined. Bad practice. FI Empty finalizer should be deleted. Bad practice. FI Explicit invocation of finalizer. Bad practice. FI Finalizer nulls fields. Bad practice. FI Finalizer only nulls fields. Bad practice. FI Finalizer does not call superclass finalizer. Bad practice. FI Finalizer nullifies superclass finalizer. Bad practice. FI Finalizer does nothing but call superclass finalizer. Bad practice. FS Format string should use n rather than n. Bad practice. GC Unchecked type in generic call. Bad practice. HE Class defines equals but not hash. CodeBad practice. HE Class defines equals and uses Object. CodeBad practice. HE Class defines hash. Code but not equalsBad practice. HE Class defines hash. Code and uses Object. Bad practice. HE Class inherits equals and uses Object. CodeBad practice. IC Superclass uses subclass during initialization. Bad practice. IMSE Dubious catching of Illegal. Monitor. State. Exception. Bad practice. ISC Needless instantiation of class that only supplies static methods. Bad practice. It Iterator next method cant throw No. Such. Element. Exception. Bad practice. J2. EE Store of non serializable object into Http. Session. Bad practice. JCIP Fields of immutable classes should be final. Bad practice. ME Public enum method unconditionally sets its field. Bad practice. ME Enum field is public and mutable. Bad practice. NP Method with Boolean return type returns explicit null. Bad practice. NP Clone method may return null. Bad practice. NP equals method does not check for null argument. Bad practice. NP to. String method may return null. Bad practice. Nm Class names should start with an upper case letter. Bad practice. Nm Class is not derived from an Exception, even though it is named as such. Bad practice. Nm Confusing method names. Bad practice. Nm Field names should start with a lower case letter. Bad practice. Nm Use of identifier that is a keyword in later versions of Java. Bad practice. Nm Use of identifier that is a keyword in later versions of Java. Bad practice. Nm Method names should start with a lower case letter. Bad practice. Nm Class names shouldnt shadow simple name of implemented interface. Bad practice. Nm Class names shouldnt shadow simple name of superclass. Bad practice. Nm Very confusing method names but perhaps intentionalBad practice. Nm Method doesnt override method in superclass due to wrong package for parameter. Bad practice. ODR Method may fail to close database resource. Bad practice. ODR Method may fail to close database resource on exception. Bad practice. OS Method may fail to close stream. Bad practice. OS Method may fail to close stream on exception. Vista Information Consulting Uae on this page. Bad practice. PZ Dont reuse entry objects in iterators. Bad practice. RC Suspicious reference comparison to constant. Bad practice. RC Suspicious reference comparison of Boolean values. Bad practice. RR Method ignores results of Input. Stream. readBad practice. RR Method ignores results of Input. Stream. skipBad practice. RV Negating the result of compare. TocompareBad practice. RV Method ignores exceptional return value. Bad practice. SI Static initializer creates instance before all static final fields assigned. Bad practice. SW Certain swing methods needs to be invoked in Swing thread. Bad practice. Se Non transient non serializable instance field in serializable class. Bad practice. Se Non serializable class has a serializable inner class. Bad practice. Se Non serializable value stored into instance field of a serializable class. Bad practice. Se Comparator doesnt implement Serializable. Bad practice. Se Serializable inner class. Bad practice. Se serial. Version. UID isnt final. Bad practice. Se serial. Version. UID isnt long. Bad practice. Se serial. Version. UID isnt static. Bad practice. Se Class is Serializable but its superclass doesnt define a void constructor. Bad practice. Se Class is Externalizable but doesnt define a void constructor. Bad practice. Se The read. Resolve method must be declared with a return type of Object. Bad practice. Se Transient field that isnt set by deserialization. Bad practice. Sn. VI Class is Serializable, but doesnt define serial. Version. UIDBad practice. UI Usage of Get. Resource may be unsafe if class is extended. Bad practice. BC Impossible cast. Correctness. BC Impossible downcast. Correctness. BC Impossible downcast of to. Array result. Correctness. BC instanceof will always return false. Correctness. BIT Bitwise add of signed byte value. Correctness. BIT Incompatible bit masks. Correctness. BIT Check to see if. Correctness. BIT Incompatible bit masks. Correctness. BIT Bitwise OR of signed byte value. Correctness. BIT Check for sign of bitwise operation. Correctness. BOA Class overrides a method implemented in super class Adapter wrongly. Correctness. BSHIFT Possible bad parsing of shift operation. Correctness. BSHIFT 3. Correctness. DLS Useless increment in return statement. Correctness. DLS Dead store of class literal. Correctness. DLS Overwritten increment. Correctness. DMI Reversed method arguments. Correctness. DMI Bad constant value for month. Correctness. DMI Big. Decimal constructed from double that isnt represented precisely. Correctness. DMI has. Next method invokes next. Correctness. DMI Collections should not contain themselves. Correctness. DMI Doh A nonsensical method invocation. Correctness. DMI Invocation of hash. Code on an array. Correctness. DMI Double. Bits. To. Double invoked on an int. Correctness. DMI Vacuous call to collections. Correctness. Dm Cant use reflection to check for presence of annotation without runtime retention. Correctness. Dm Futile attempt to change max pool size of Scheduled. Svp Keygen Software. Thread. Pool. Executor. Correctness. Dm Creation of Scheduled. Thread. Pool. Executor with zero core threads. Apache HBase Reference Guide. HBase provides several tools for administration, analysis, and debugging of your cluster. The entry point to most of these tools is the binhbase command, though some tools are available in the dev support directory. To see usage instructions for binhbase command, run it with no arguments, or with the h argument. These are the usage instructions for HBase 0. Some commands, such as version, pe, ltt, clean, are not available in previous versions. Usage hbase lt options lt command lt args. DIR Configuration direction to use. Default. conf. hosts HOSTS Override the list in regionservers file. Some commands take arguments. Pass no args or h for usage. Run the HBase shell. Run the hbase fsck tool. Write ahead log analyzer. Store file analyzer. Run the Zoo. Keeper shell. Upgrade hbase. master Run an HBase HMaster node. Run an HBase HRegion. Server node. zookeeper Run a Zoo. Keeper server. rest Run an HBase REST server. Run the HBase Thrift server. Run the HBase Thrift. Run the HBase clean up script. Dump hbase CLASSPATH. Dump CLASSPATH entries required by mapreduce. Run Performance. Evaluation. Run Load. Test. Tool. Print the version. CLASSNAME Run the class named CLASSNAMESome of the tools and utilities below are Java classes which are passed directly to the binhbase command, as referred to in the last line of the usage instructions. Others, such as hbase shell The Apache HBase Shell, hbase upgrade Upgrading, and hbase thrift Thrift API and Filter Language, are documented elsewhere in this guide. Canary. There is a Canary class can help users to canary test the HBase cluster status, with every column family for every regions or Region. Servers granularity. To see the usage, use the help parameter. HBASEHOMEbinhbase canary help. Usage binhbase org. Canary opts table. Show this help and exit. Continuous check at defined intervals. N Interval between checks sec. Use regionregionserver as regular expression. B stop whole program if first error occurs, default is true. N timeout for a check, default is 6. Sniffing enable the write sniffing in canary. Failure. As. Error treats read write failure as error. Table The table used for write sniffing. Default is hbase canary. Dlt config. Property lt value assigning or override the configuration params. This tool will return non zero error codes to user for collaborating with other monitoring tools, such as Nagios. The error code definitions are privatestaticfinalint USAGEEXITCODE 1. INITERROREXITCODE 2. TIMEOUTERROREXITCODE 3. ERROREXITCODE 4 Here are some examples based on the following given case. There are two Table objects called test 0. Region. Servers. see following table. Region. Servertest 0. Following are some examples based on the previous given case. Canary test for every column family store of every region of every table HBASEHOMEbinhbase canary. INFO tool. Canary read from region test 0. INFO tool. Canary read from region test 0. INFO tool. Canary read from region test 0. INFO tool. Canary read from region test 0. INFO tool. Canary read from region test 0. INFO tool. Canary read from region test 0. INFO tool. Canary read from region test 0. INFO tool. Canary read from region test 0. So you can see, table test 0. Canary tool will pick 4 small piece of data from 4 2 region 2 store different stores. This is a default behavior of the this tool does. Canary test for every column family store of every region of specific tablesYou can also test one or more specific tables. HBASEHOMEbinhbase canary test 0. Canary test with Region. Server granularity. This will pick one small piece of data from each Region. Server, and can also put your Region. Server name as input options for canary test specific Region. Server. HBASEHOMEbinhbase canary regionserver. INFO tool. Canary Read from table test 0. INFO tool. Canary Read from table test 0. INFO tool. Canary Read from table test 0. Canary test with regular expression pattern. This will test both table test 0. HBASEHOMEbinhbase canary e test 01 21. Run canary test as daemon mode. Run repeatedly with interval defined in option interval whose default value is 6 seconds. This daemon will stop itself and return non zero error code if any error occurs, due to the default value of option f is true. HBASEHOMEbinhbase canary daemon. Run repeatedly with internal 5 seconds and will not stop itself even if errors occur in the test. HBASEHOMEbinhbase canary daemon interval 5. Force timeout if canary test stuck. In some cases the request is stuck and no response is sent back to the client. This can happen with dead Region. Servers which the master has not yet noticed. Because of this we provide a timeout option to kill the canary test and return a non zero error code. This run sets the timeout value to 6. HBASEHOMEbinhbase canary t 6. Enable write sniffing in canary. By default, the canary tool only check the read operations, its hard to find the problem in the. To enable the write sniffing, you can run canary with the write. Sniffing option. When the write sniffing is enabled, the canary tool will create an hbase table and make sure the. In each sniffing period, the canary will. HBASEHOMEbinhbase canary write. Sniffing. The default write table is hbase canary and can be specified by the option write. Table. HBASEHOMEbinhbase canary write. Sniffing write. Table ns canary. The default value size of each put is 1. Treat read write failure as error. By default, the canary tool only logs read failure, due to e. Retries. Exhausted. Exception. while returning normal exit code. To treat read write failure as error, you can run canary. Failure. As. Error option. When enabled, read write failure would result in error. HBASEHOMEbinhbase canary treat. Failure. As. Error. Running Canary in a Kerberos enabled Cluster. To run Canary in a Kerberos enabled cluster, configure the following two properties in hbase site. Game Gutterball 2 Full Version. Kerberos credentials are refreshed every 3. Canary runs in daemon mode. To configure the DNS interface for the client, configure the following optional properties in hbase site. Example 5. 6. Canary in a Kerberos Enabled Cluster. This example shows each of the properties with valid values. HOSTYOUR REALM. COMlt value lt property lt property lt name hbase. Health Checker. You can configure HBase to run a script periodically and if it fails N times configurable, have the server exit. See HBASE 7. 35. Periodic health check script for configurations and detail. Driver. Several frequently accessed utilities are provided as Driver classes, and executed by the binhbase command. These utilities represent Map. Reduce jobs which run on your cluster. They are run in the following way, replacing Utility. Name with the utility you want to run. This command assumes you have set the environment variable HBASEHOME to the directory where HBase is unpacked on your server. HBASEHOMEbinhbase org. Utility. Name. The following utilities are available Load. Incremental. HFiles. Complete a bulk data load. Copy. Table. Export a table from the local cluster to a peer cluster. Export. Write table data to HDFS. Import. Import data written by a previous Export operation. Import. Tsv. Import data in TSV format.