Java Technology
Purpose
The Application Server Java is a fully Java™ 2 Enterprise Edition (J2EE) 1.3 compliant application server. The J2EE standard has been defined by the Java Community according to the rules of the Java Community Process and is copyright protected by Sun Microsystems. SAP has been a member of the Executive Committee of the Java Community since November 2002.
Features
● Available, reliable, and scalable architecture
The
AS Java
architecture avoids single points of failure in the cluster environment by load balancing
client requests between server processes. The
load balancing
system distributes client requests across the server
processes of the cluster and optimizes the capacity of each server process.
Requests are parsed by the Java dispatcher and forwarded for processing to
individual server processes. The Web AS Java
failover system
also provides session failover to preserve the state of the user session. If a
server process becomes unavailable, the state of the user session is recovered
transparently on another available server process.
● Centralized system landscape management
The
SAP NetWeaver
Administrator provides a central entry point to the whole SAP NetWeaver
system landscape. The SAP NetWeaver Administrator enables starting and
stopping of systems, services, and applications, as well as technical
configuration, user management, system monitoring, log viewing, and
application and performance tracing.
● Comprehensive security technologies for heterogeneous environments
The AS Java implements the Java Authentication and
Authorization Service (JAAS) API, enabling efficient user and
authentication
management. AS Java provides pluggable login modules based on the JAAS
that support various authentication methods, including basic authentication,
log-on tickets, X509 certificates, SAML and WSSec, which support efficient
integration in Single Sign-On environments. Security
administration tools allow troubleshooting and security administration
tasks both for individual systems and entire system landscapes. In addition,
the Web AS Java enables you to take full advantage of your network
infrastructure by allowing for filtered communication over firewalls and
packet filtering devices. Consistent with the open architecture of SAP
NetWeaver,
transport layer
security on the AS Java is implemented through support for Generic
Security Services API, the Java Cryptography Extension and
Secure Network
Communications (SNC) for SAP-specific
communication.
● Consistent development environment covering the entire software life cycle
The
SAP NetWeaver
Developer Studio provides a complete set of development tools covering all
aspects of Java development to develop, build, deploy, and execute
applications centrally.
The SAP
NetWeaver Developer Studio also provides access to the
NetWeaver Development
Infrastructure (NWDI). The NWDI enables distributed and team-oriented
development via central source code storage and versioning, component-based
build process, development landscape and transports management.
● Sophisticated model-driven UI development
Web Dynpro
provides a client-independent programming model for developing professional
user interfaces.Web Dynpro tools support application development
during the implementation and design phases. Web Dynpro applications are
developed with a declarative programming approach to produce a
platform-independent metamodel. The necessary source code is then generated
automatically and executed at runtime. You can access the source code of your
application from the development environment and thus define events for your
Web Dynpro application. The generated source code contains separate, specially
marked areas for this purpose.
● Web Services integration
Web services are
Web-based interfaces that can be integrated into a company’s business
scenarios. Using Web services enables you to combine functions implemented on
different software components into a single process. Web services are
self-contained, modularized, executable entities that can be published,
searched for, and accessed across a network. The Java Web Service Infrastructure allows
developers to integrate Web services, irrespective of where they reside or how
they are implemented. Therefore, business processes spanning different
systems, both intra-company and cross-company, can be implemented.
● Database-independent persistence framework
The
Open SQL for Java
framework provides a database
abstraction level for truly portable database-independent applications. Open
SQL for Java enhances performance by providing statement pooling and table
buffers, caches open database connections in a server-side database connection
pool transparently to applications, and facilitates maintenance by monitoring
and tracing facilities. The Web AS Java also provides the Java Dictionary as a
central repository for database objects. The Java Dictionary is fully
integrated in the NetWeaver Developer Studio and enables portable definition,
creation and modification of database objects, manages database objects’
life cycle, and performs statement checks against Open SQL grammar and table
definitions.
See also: