Requesting codes from问题

T-Quake 2013-04-09 10:27:54
Android4.0.3
大家好,我最近在我的应用中出现这么个问题:
Caused by: java.lang.SecurityException: Requesting code from com.android.localapp (with uid 10072)
查看了下代码实在这个地方
activityManager.startActivity("0", intent).getDecorView();
报了异常,但是不是必先,几乎很少会突然出现。
我看了下异常的调用栈最后一句是:at android.app.ActivityThread.getPackageInfo(ActivityThread.java:1582)我去查了下android4.0.3的源码,异常出现在这个地方:

public final LoadedApk getPackageInfo(ApplicationInfo ai, CompatibilityInfo compatInfo, int flags) {

boolean includeCode = (flags&Context.CONTEXT_INCLUDE_CODE) != 0;

boolean securityViolation = includeCode && ai.uid != 0 && ai.uid != Process.SYSTEM_UID && (mBoundApplication != null? ai.uid != mBoundApplication.appInfo.uid : true);
if ((flags&(Context.CONTEXT_INCLUDE_CODE
|Context.CONTEXT_IGNORE_SECURITY))
== Context.CONTEXT_INCLUDE_CODE) {
if (securityViolation) {
//报错在这
String msg = "Requesting code from " + ai.packageName
+ " (with uid " + ai.uid + ")";

if (mBoundApplication != null) {
msg = msg + " to be run in process "
+ mBoundApplication.processName + " (with uid "
+ mBoundApplication.appInfo.uid + ")";
}
throw new SecurityException(msg);
}

}

return getPackageInfo(ai, compatInfo, null, securityViolation, includeCode);
}
本地app出错在一个activitygroup中,不知道是为什么很奇怪,话说,也没有去调用其他进程中的activity啊,咋会出现这个异常呢。。。
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danielinbiti 2013-09-05
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activityManager.startActivity("0", intent) =============== activityManager 是什么组件?ViewFlipper? 普通的activity也只有 startActivity一般也只有startActivity(intent)和startAcivityForResult(intent,0);
天若子 2013-09-05
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我也不报咋解决啊?
qq408170918 2013-05-28
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楼主这个问题有没解决啊
1. USB Basics 1 What USB Can Do 2 Benefits for Users 2 Benefits for Developers 6 Beyond the Hype 10 Evolution of an Interface 13 Original USB 14 USB 2.0 15 USB On-The-Go 16 Wireless USB 16 USB versus IEEE-1394 16 USB versus Ethernet 17 Bus Components 17 Topology 18 Defining Terms 19 Contents iv Division of Labor 22 The Host’s Duties 22 The Peripheral’s Duties 25 What about Speed? 28 Developing a Device 29 Elements in the Link 29 Tools for Developing 30 Steps in Developing a Project 30 2. Inside USB Transfers 33 Transfer Basics 34 Enumeration Communications 34 Application Communications 34 Managing Data on the Bus 35 Host Speed and Bus Speed 36 Elements of a Transfer 37 Device Endpoints: the Source and Sink of Data 38 Pipes: Connecting Endpoints to the Host 40 Types of Transfers 40 Stream and Message Pipes 42 Initiating a Transfer 43 Transactions: the Building Blocks of a Transfer 44 Transaction Phases 45 Ensuring that Transfers Are Successful 51 Handshaking 51 Reporting the Status of Control Transfers 55 Error Checking 56 3. A Transfer Type for Every Purpose 61 Control Transfers 61 Availability 62 Structure 62 Data Size 66 Speed 66 Detecting and Handling Errors 68 Bulk Transfers 68 Availability 69 Structure 69 Data Size 69 Speed 71 Detecting and Handling Errors 71 Contents v Interrupt Transfers 72 Availability 72 Structure 72 Data Size 73 Speed 73 Detecting and Handling Errors 75 Isochronous Transfers 76 Availability 76 Structure 76 Data Size 79 Speed 79 Detecting and Handling Errors 80 More about Time-critical Transfers 80 Bus Bandwidth 81 Device Capabilities 81 Host Capabilities 82 Host Latencies 83 4. Enumeration: How the Host Learns about Devices 85 The Process 86 Enumeration Steps 87 Enumerating a Hub 91 Device Removal 92 Tips for Successful Enumeration 92 Descriptors 93 Types of Descriptors 94 Device Descriptor 96 Device_qualifier Descriptor 99 Configuration Descriptor 101 Other_speed_configuration Descriptor 103 Interface Association Descriptor 103 Interface
EhLib 9.3 Build 9.3.026 source included version. ------------------------------------------------- The Library contains components and classes for Borland Delphi versions 7, 9, Developer Studio 2006, Delphi 2007, Embarcadero RAD Studio 2009-XE10.3, Lazarus. TABLE OF CONTENTS ----------------- Overview Installation Library Installation Help Demonstration Programs Registering and Prices Other information About author Where to start. ------------------- Start overview of the library with the main Demo project .\Demos\Bin\MainDemo.Exe. (Compiled Demo files are available in the Evaluation version of the library) If you've used previous versions of the library, then you can read a summary of the new features and changes in the file history-eng.html. More detail about new features in this version of the library can be found in the file - About EhLib 9.2 Eng.doc To install a new version of the library in the IDE, use the installation program .\Installer\EhLibInstaller.exe If, at the installation have any problems, write a letter to ehlib support address support@ehlib.com You can also install the files in the library IDE manually, as described in Section 2. Installation Library After installation, make sure the operability of all installed components. To do this, open the IDE, compile and launch a major demonstration project .\Demos\MainDemo\Project1_XE2.dpr Read next file for full instructions of working with the library components: .\Hlp\ENG\"EhLib - Users guide.doc" Read about EhLib for Lazarus in the file - Lazarus<*>\readme.txt Overview -------- The Library contains several components and objects. TDBGridEh component TDBGridEh provides all functionality of TDBGrid and adds several new features as follows: Allows to select records, columns and rectangle areas. Special titles that can correspond to several/all columns. Footer that is able to show sum/count/other field values. Automatic column resizing to set grid width equal client width. Ability to change row and title height. Allows automatic broken of a single line long title and data row to a multiline. Title can act as button and, optionally show a sort marker. Automatically sortmarking. Ability to truncate long text with ellipsis. Lookup list can show several fields. Incremental search in lookup fields. Frozen columns. DateTime picker support for TDateField and TDateTimeField. Allows to show bitmaps from TImageList depending on field value. Allows to hide and track horizontal or vertical scrollbars. Allows to hide columns. Allows to show 3D frame for frozen, footer and data rows. Allows to draw memo fields. Multiline inplace editor. Proportional scrolling independently of sequenced of dataset. Automatically show checkboxes for Boolean fields. Allows to show checkboxes for other type of fields. Has a procedures to save and restore layout (visible columns, columns order, columns width, sortmarkers, row height) in/from registry or ini file. Allows to show hint (ToolTips) for text that don't fit in the cell. Allows to export data to Text, Csv, HTML, RTF, XLS and internal formats. Allows to import data from Text and internal formats. Can sort data in various dataset's. Can filter data in various dataset's. When DBGridEh is connected to DataSet of TMemTable type it allows: To view all data without moving active record. To display a tree-type structure of TMemTable records. To form list of values in dropdown list of SubTitle filter automatically. To create grouping records basing on the selected coulmns. TDBVertGridEh component Component to show one record from dataset in Vertical Orientation. Have a special column to show Field Captions Can customize inplace editor and data of the cell like in DBGridEh. TDBLookupComboboxEh component Provides all functionality of TDBLookupCombobox and adds several new features as follows: Can have flat style. Allows assign values as to KeyValue property just and to display Text property. Allows to type (assign) values to Text property not contained in data list (Style = csDropDownEh). Allows to hold KeyValue and Text as not affecting to each other values. Take effect when KeyField, ListField, ListSource, DataField and DataSource properties is empty. Drop down list can: Show titles, Have sizing grip, Automaticaly set width as sum of DisplayWidth of the list fields (Width = -1), Automaticaly drops on user pressed the key. Edit button can: Show DropDown, Ellipsis or Bitmap image. Have specified width. Have additional events: OnKeyValueChanged, OnButtonClick. TDBSumList component This component is intended for totaling sums and amounts of records in a TDataSet with dynamic changes. Component keeps a list of TDBSum objects, which contains types of group operations (goSum or goCount) and name sum field (goCount name of field is unnecessary). TPrintDBGridEh component TPrintDBGridEh provides properties and routines for preview and print of TDBGridEh component with several features: Ability to expand rows vertically until all text is printed. Ability to scale grid to fit it to page width. Ability to print/preview title for grid. Ability to print/preview page header and page footer where you can specify macros for current page, current date, current time and/or static text. Automatically print/preview multiselected area of TDBGridEh if it area is not empty. Ability to print/preview rich text before and after grid. TPreviewBox component TPreviewBox lets you create a customizable runtime preview. TPrinterPreview object TPrinterPreview lets you to record printable data in buffer for following output them on screen and to printer. TPrinterPreview have all functions and properties as in TPrinter object. You can use TPrinterPreview object similarly of TPrinter except some details. In TPrinter Printer.Canvas.Handle and Printer.Handle is the same but in TPrinterPreview PrinterPreview.Canvas.Handle represent the metafile in that is recored the data and PrinterPreview.Handle represent Printer.Handle. That is mean that you have to use PrinterPreview.Canvas.Handle for draw operation (DrawText, DrawTexteEx, e.t.c.) and use PrinterPreview.Handle in functions that return information about printer facilities (GetDeviceCaps, e.t.c.). Global function PrinterPreview returns default PrinterPreview object and shows data in default preview form. TDBEditEh component represents a single or multi-line edit control that can display and edit a field in a dataset or can works as non data-aware edit control. TDBDateTimeEditEh component represents a single-line date or time edit control that can display and edit a datetime field in a dataset or can works as non data-aware edit control. TDBComboBoxEh component represents a single or multi-line edit control that combines an edit box with a scrollable list and can display and edit a field in a dataset or can works as non data-aware combo edit control. TDBNumberEditEh component represents a single-line number edit control that can display and edit a numeric field in a dataset or can works as non data-aware edit control. TPropStorageEh, TIniPropStorageManEh, TRegPropStorageManEh components Components realize technology to store component properties to/from settings storage such as ini files, registry etc. TMemTableEh component dataset, which hold data in memory. Its possible consider as an array of records. Besides, it: Supports a special interface, which allows DBGridEh component to view all data without moving active record. Allows fetch data from TDataDriverEh object (DataDriver property). Allows unload change back in DataDriver, operative or postponed (in dependencies of the CachedUpdates property). Allows to create a master/detail relations on the client (filtering record) or on the external source (updating parameters [Params] and requiring data from DataDriver). Allows once-only (without the dynamic support) sort data, including Calculated and Lookup field. Allows create and fill data in design-time and save data in dfm file of the Form. Allows keep record in the manner of trees. Each record can have record elements-branches and itself be an element to other parental record. Component TDBGridEh supports to show the tree-type structure of these records. Allows to connect to the internal array of other TMemTableEh (via ExternalMemData property) and work with its data: sort, filter, edit. Has interface for requesting list of all unique values in one column of records array, ignoring local filter of the DataSet. TDBGridEh uses this property for automatic filling a list in DropDownBox of the subtitle filter cell. TDataDriverEh component carry out two tasks: Delivers data to TMemTableEh. Processes changed records of TMemTableEh (writes them in other dataset, or call events for processing the changes in program). TSQLDataDriverEh DataDriver that have four objects of the TSQLCommandEh type: SelectCommand, DeleteCommand, InsertCommand, UpdateCommand, GetrecCommand. TSQLDataDriverEh can not transfer queries to the server but it call global (for application) event which it is necessary to write to execute SQL expressions on the server. TBDEDataDriverEh, TIBXDataDriverEh, TDBXDataDriverEh and TADODataDriverEh Components. These are SQLDataDrivers that can deliver queries to the server using corresponding drivers of the access to datas. -------------------- 2. Installation Library -------------------- -------------------- 2.1 Installing library automatically -------------------- Run EhLibInstaller.exe program from "Installer" folder to install EhLib in Delphi/C++ Builder IDE. The program creates folders to keep EhLib binary and other requared files, copies requared files to created folders, compiles packages, register packages in IDE and write requared paths in registry. If you have executable installation program (for example, EhLibSetupD7Eval.exe) then you only need to run program and follow installation process. Setup automatically writes all units in necessary directory, installs packages and help files in IDE. -------------------- 2.2 Installing library manually ------------------- Follow next instructions to install files from EhLib archive: -- 2.2.1. For RAD Studio XE2 (Delphi) or higher: --------------------------------------------------------------------- Uninstall previous or evaluation version of EhLib (Old version) from Delphi IDE. Remove or copy to other directory files of old version to prevent crossing old and new version of EhLib (Including EhLib.bpl, EhLib.dcp or EhLibXX.bpl, EhLibXX.dcp, EhLibDataDriversXX, DclEhLibDataDriversXX files). These files can be located in the following folders on your computer C:\Users\All Users\Documents\RAD Studio\1X.0 C:\Users\All Users\Documents\Embarcadero\Studio\XX.0\Bpl C:\Users\All Users\Documents\Embarcadero\Studio\XX.0\Dcp Create new folder where source code and binary files will be kept (For example, C:\RAD_Studio_XE2\Components\EhLib). Hereinafter this folder will be call as "EhLib folder". Create new subfolder "Lib" in the "EhLib folder". Copy files from folders "Common", "RADStudioXE2" and "LangResources\Res" of EhLib archive into the folder "[EhLib folder]\Lib" as that all files were in one folder - "Lib". Default language resource of the library is English. If you want to change it to the other language do the next steps: - Select one of language file EhLibLangConsts.XXX.dfm - Copy this file to EhLibLangConsts.dfm file (with replacment of existing file) - In the first line of a new EhLibLangConsts.dfm file delete _XXX suffix in the name of object like this: object TEhLibLanguageConsts_ENU -> object TEhLibLanguageConsts Run RAD Studio IDE and Open EhLibProjGroup160.groupproj file from [EhLib folder]\Lib. Compile all packages of Prject Group. Install DclEhLibXX.Dpk and DclEhLibDataDriversXX.Dpk packages in IDE (Use Project/Install menu). Consistently compile packages EhLibXX.Dpk and EhLibDataDriversXX.Dpk in next modes: Win32\Debug Win64\Release Win64\Debug After compilation there should be created subfolders a Win32\Release, Win32\Debug, Win64\Release, Win64\Debug in the "[EhLib folder]\Lib" folder. Copy the *. dfm and *. res files from the "[Folder EhLib]\Lib" folder into the each of the next folders: Win32\Release, Win32\Debug, Win64\Release, Win64\Debug In the RAD Studio IDE add next paths: "[EhLib folder]\Lib\Win32\Release" path in the "Library path" for the Win32 platform. "[EhLib folder]\Lib\Win32\Debug" path in the "Debug dcu" for the Win32 platform. "[EhLib folder]\Lib\" path in the "Browsing path" for the Win32 platform. "[EhLib folder]\Lib\Win64\Release" path in the "Library path" for the Win64 platform. "[EhLib folder]\Lib\Win64\Debug" path in the "Debug dcu" for the Win64 platform. "[EhLib folder]\Lib\" path in the "Browsing path" for the Win64 platform. -- Copy DEMOS folder from the Archive EhLib to the "[EhLib Folder]". Open and compile any demo project for test. 2.2.2. Delphi 5.x - 7.x, Delphi 9.X Win32, BDS2006 Win32, Delphi2007, CodeGear RAD Studio 2009: ------------------------------------------------------------------------------- Uninstall previous or evaluation version of EhLib (Old version) from Delphi IDE. Remove or copy to other directory files of old version to prevent crossing old and new version of EhLib (Including EhLib.bpl, EhLib.dcp or EhLibXX.bpl, EhLibXX.dcp, EhLibDataDriversXX, DclEhLibDataDriversXX files). Create directory from which you will install EhLib library ('EhLib directory') (for example, C:\Delphi[X]\EhLib). Copy files from "Common", "Delphi[X]" | "BDS2006" and "LangResources\Res.Ansi" folders of the EhLib archive to 'EhLib directory'. Default language resource of the library is English. If you want to change it to the other language do the next steps: - Select one of language file EhLibLangConsts.XXX.dfm - Copy this file to EhLibLangConsts.dfm file (with replacment of existing file) - In the first line of a new EhLibLangConsts.dfm file delete _XXX suffix in the name of object like this: object TEhLibLanguageConsts_ENU -> object TEhLibLanguageConsts By default Delphi (5, 6 and 7) places compiled files to the \Projects\Bpl directory and this directory already present in the search PATH. But if you overwrite default BPL directory then you need put compiled EhLibXX.BPL file into directory that is accessible through the search PATH (i.e. DOS "PATH" environment variable; for example, in the Windows\System directory). Add, (if needed) 'EhLib directory' in Tools->Environment Options->Library-> Library Path (For Delphi 9 in Tools->Options->Environment Options-> Delphi Options->Library - Win32->Library Path). Use "File\Open..." menu item of Delphi IDE to open the runtime package - EhLibXX.Dpk. In "Package..." window click "Compile" button to compile the package. After that open and compile EhLibDataDriversXX.Dpk. After compiling run-time packages install design-time packages DclEhLibXX.BPL and DclEhLibDataDriversXX.BPL into the IDE. For that use "File\Open..." menu item to open design-time package DclEhLibXX.Dpk. In "Package..." window click "Compile" button to compile the package and then click "Install" button to register EhLib components on the component palette. Open and install DclEhLibDataDriversXX.Dpk package. EhLib components have to appear on 'EhLib' page of components palette. 2.2.4. Delphi 9.X Vcl.Net, , BDS2006 Vcl.Net: ---------------------------------------- Uninstall previous or evaluation version of EhLib (Old version) from Delphi IDE. Remove or copy to other directory files of old version to prevent crossing old and new version of EhLib (Including Vcl.EhLib90.dll, Vcl.DclEhLib90.dll, Vcl.EhLibDataDrivers90.dll, Vcl.DclEhLibDataDrivers90.dll files). Create directory from which you will install EhLib library ('EhLib directory') (for example, C:\BDS\3.0\EhLibVclNet). Copy files from Common and Delphi9 directories of the EhLib archive to 'EhLib directory'. In Delphi IDE: Add, (if needed) 'EhLib directory' in Component->Installed .NET Components ...-> Assembly Search Paths. Add, (if needed) 'EhLib directory' in Tools->Options->Environment Options-> Delphi Options->Library - NET->Library Path. Use "File\Open..." menu item of Delphi IDE to open the runtime package - Vcl.EhLibXX.Dpk. In "Project Manager..." window, click right button above 'Vcl.EhLibXX.Dll' and select "Build" menu to compile package. After that, open and compile Vcl.EhLibDataDriversXX.Dpk, Vcl.DclEhLibXX.Dpk and Vcl.DclEhLibDataDriversXX.Dpk. Open menu "Component->Installed .NET Components ..."->.NET VCL Components. Press 'Add...' button. Locate 'Vcl.DclEhLibXX.dll' and press 'Open'. (By default, this file have to be located in 'EhLib directory' directory) Press 'Ok' in 'Installed .NET Components' Dialog. 4. Documentation and Help ------------------------- 4.1. This version of library doesn't have embedded help files for Delphi8 or Higher. But the online help is available on the ehlib home page - http://www.ehlib.com/online-help 4.2. Delphi 7.x: Copy the EhLib.hlp and EhLib.cnt files to the Delphi HELP subdirectory. Select Help|Customize to start the OpenHelp application. Add the EhLib.cnt file to the Contents page, add the EhLib.hlp file to the Index and Link pages. 5. Demonstration Programs and Projects -------------------------------------- Demonstration programs use tables from the DEMOS directory and ADO Data Access. Read description of Demo projects in the file Demos\Info Eng.doc 6. Registering and Prices ------------------------- The EhLib is a Commercial product. If you find it useful and want to receive the latest versions please register your evaluation copy. You can read detailed information about prices on ehlib home prices page http://www.ehlib.com/buy You can read detailed information about registration at https://secure.shareit.com/shareit/product.html?productid=102489 After registration you will receive (e-mail only) address of registered version for downloading and password for unpacking. By registering the components you get the following advantages: 1. You will get new versions of the library free within a year from the date of registration. 2. You will get technical support for the library all the time. 3. You encourage EhLib Team to make the library even better. 7. Other information ----------------- The ability to compile applications for OS X and Linux in combination with the CrossVCL library is only available in the EhLib version with source codes. The ability to compile applications under Linux is available only in the EhLib version with source codes. 8. About Company ---------------- Contact as if you have any questions, comments or suggestions: EhLib Team www: http://www.ehlib.com E-mail: support@ehlib.com Skype support: ehlib.support
Java Platform Standard Edition 7 Documentation What's New Documentation Release Notes Tutorials and Training The Java Tutorials Java Training More Information Java SE 7 Names and Versions Java SE White Papers Documentation Accessibility Specifications Installation Instructions Supported Systems Configurations Java SE 7 and JDK 7 Compatibility JDK 7 Adoption Guide Troubleshooting Java SE About Test / Sample Applications and Code Resources Oracle Java SE Advanced and Oracle Java SE Suite Open JDK Bugs Database Downloads Java SE Downloads Community Forums Blogs User Groups Wikis Newsletters Events Other Technologies Java EE Java ME Java FX GlassFish NetBeans Oracle has two products that implement Java Platform Standard Edition (Java SE) 7: Java SE Development Kit (JDK) 7 and Java SE Runtime Environment (JRE) 7. JDK 7 is a superset of JRE 7, and contains everything that is in JRE 7, plus tools such as the compilers and debuggers necessary for developing applets and applications. JRE 7 provides the libraries, the Java Virtual Machine (JVM), and other components to run applets and applications written in the Java programming language. The following conceptual diagram illustrates Java component technologies: JDK Java Language Java Language ` Tools & Tool APIs java javac javadoc jar javap JPDA JConsole Java VisualVM Java DB Security Int'l RMI IDL Deploy Monitoring Troubleshoot Scripting JVM TI JRE RIAs Java Web Start Applet / Java Plug-in User Interface Toolkits AWT Swing Java 2D Accessibility Drag n Drop Input Methods Image I/O Print Service Sound Java SE API Integration Libraries IDL JDBC JNDI RMI RMI-IIOP Scripting Other Base Libraries Beans Int'l Support Input/Output JMX JNI Math Networking Override Mechanism Security Serialization Extension Mechanism XML JAXP lang and util Base Libraries lang and util Collections Concurrency Utilities JAR Logging Management Preferences API Ref Objects Reflection Regular Expressions Versioning Zip Instrumentation Java Virtual Machine Java HotSpot Client and Server VM Description of Java Conceptual Diagram What's New in Documentation Documentation is regularly updated to provide developers with in-depth information about new features in the Java platform. Some recent updates include: Swing The JLayer class has been added, which is a flexible and powerful decorator for Swing components; see How to Decorate Components with JLayer. The Nimbus Look and Feel has been moved from the com.sun.java.swing package to the javax.swing package; see the javax.swing.plaf.nimbus package. Mixing Heavyweight and Lightweight Components is easier to accomplish. Windows with transparency and non-rectangular shape are supported; see How to Create Translucent and Shaped Windows An HSV tab has been added to the JColorChooser class. Java I/O The java.nio.file package and its related package, java.nio.file.attribute, provide comprehensive support for file I/O and for accessing the file system; see File I/O (featuring NIO.2). NIO stands for non-blocking I/O. The directory /sample/nio/chatserver/ contains samples that demonstrate the new APIs contained in the java.nio.file package. The directory /demo/nio/zipfs/ contains samples that demonstrate the NIO.2 NFS (Network File System) file system. Networking The URLClassLoader.close method has been added; see Closing a URLClassLoader. The Sockets Direct Protocol (SDP) provides access to high performance network connections; see Understanding the Sockets Direct Protocol. Security A new native provider has been added that provides several ECC-based algorithms (ECDSA/ECDH); see Sun PKCS#11 Provider's Supported Algorithms in Java PKCS#11 Reference Guide. Weak cryptographic algorithms can now be disabled; see Appendix D: Disabling Cryptographic Algorithms in Java PKI Programmer's Guide and Disabled Cryptographic Algorithms in Java Secure Socket Extension (JSSE) Reference Guide. Various enhancements related to SSL/TLS have been added to Java Secure Socket Extension. Collections The TransferQueue interface has been added, which is a refinement of the BlockingQueue interface. The class LinkedTransferQueue implements the TransferQueue interface. Concurrency The fork/join framework, which is based on the ForkJoinPool class, is an implementation of the Executor interface. It is designed to efficiently run a large number of tasks using a pool of worker threads. A work-stealing technique is used to keep all the worker threads busy, to take full advantage of multiple processors. See Fork/Join in The Java Tutorials. The directory /sample/forkjoin/ contains samples that demonstrate the fork/join framework. The ThreadLocalRandom class eliminates contention among threads using pseudo-random numbers; see Concurrent Random Numbers. The Phaser class is a new synchronization barrier, similar to CyclicBarrier. Rich Internet Applications (RIA) and Deployment The window of a dragged applet can be decorated with a default or custom title; see Requesting and Customizing Applet Decoration in Draggable Applets. The following enhancements have been made to the syntax of JNLP files; see JNLP File Syntax: The os attribute in the information and resources elements can now contain specific versions of Windows, such as Windows Vista or Windows 7. Applications can use the install attribute in the shortcut element to specify their desire to be installed. Installed applications are not removed when the Java Web Start cache is cleared, but can be explicitly removed using the Java Control Panel. Java Web Start applications can be deployed without specifying the codebase attribute; see Deploying Without Codebase A JNLP file can be embedded into an HTML page; see Embedding JNLP File in Applet Tag. You can check the status variable of the applet while it is loading to determine if the applet is ready to handle requests from JavaScript code; see Handling Initialization Status With Event Handlers. You now have control of the window decoration style and title of an applet launched from a shortcut or dragged out of the browser; see Requesting and Customizing Applet Decoration in Developing Draggable Applets. Java 2D A new XRender-based Java 2D rendering pipeline is supported for modern X11-based desktops, offering improved graphics performance; see the xrender flag in System Properties for Java 2D Technology. The JDK now enumerates and displays installed OpenType/CFF fonts through methods such as GraphicsEnvironment.getAvailableFontFamilyNames; these fonts are also recognized by the Font.createFont method. See Selecting a Font. The TextLayout class supports Tibetan script. libfontconfig, a font configuration API, is used to select fonts to use for the logical fonts for some implementations of Linux; see Fontconfig. Java XML This release contains Java API for XML Processing (JAXP) 1.4.5, supports Java Architecture for XML Binding (JAXB) 2.2.3, and supports Java API for XML Web Services (JAX-WS) 2.2.4. Internationalization Unicode 6.0.0 is supported; see Unicode in The Java Tutorials. The directory /demo/jfc/Font2DTest/ contains samples that demonstrate Java support for Unicode 6.0. Java SE 7 can accommodate new currencies that are identified by their ISO 4217 codes; see the Currency class. java.lang Package Potential deadlocks were eliminated for multithreaded, non-hierarchically delegating custom class loaders; see Multithreaded Custom Class Loaders in Java SE 7. Java Programming Language The following enhancements have been added to the Java language: Binary Literals Underscores in Numeric Literals Strings in switch Statements Type Inference for Generic Instance Creation Improved Compiler Warnings and Errors When Using Non-Reifiable Formal Parameters with Varargs Methods The try-with-resources Statement Catching Multiple Exception Types and Rethrowing Exceptions with Improved Type Checking Java Virtual Machine Java Virtual Machine Support for Non-Java Languages: Java SE 7 introduces a new JVM instruction that simplifies the implementation of dynamically typed programming languages on the JVM. Garbage-First Collector is a server-style garbage collector that replaces the Concurrent Mark-Sweep Collector (CMS). Java HotSpot Virtual Machine Performance Enhancements JDBC 4.1 JDBC 4.1 introduces the following features: The ability to use a try-with-resources statement to automatically close resources of type Connection, ResultSet, and Statement; see Closing Connections in Processing SQL Statements. RowSet 1.1: The introduction of the RowSetFactory interface and the RowSetProvider class, which enable you to create all types of row sets supported by your JDBC driver; see Using the RowSetFactory Interface in Using JdbcRowSet Objects.

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