Top 7 Features of Jagacy TN3270 Emulator for Mainframe Access

How to configure Jagacy TN3270 Emulator — Step-by-step

1) Add Jagacy library to your project

• Install jagacy3270.jar to local Maven repo:

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mvn install:install-file -Dfile=jagacy3270.jar -DgroupId=jagacy3270 -DartifactId=jagacy3270 -Dversion=4.2.3 -Dpackaging=jar 

• Add dependency (or include jar on classpath).

2) Create jagacy.properties (basic example)

• Place a file named jagacy.properties on the classpath with entries:

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jagacy.debug=false jagacy.lock=false jagacy.terminal.type=3278-2# or 3278-3 / 3278-4 depending on model jagacy.charset=IBM1047 jagacy.ssl=false 

• Adjust terminal.type and charset to match host requirements.

3) Define a session configuration (session.xml or properties)

• Example minimal session properties (you can use Java API instead of XML):

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session0.host=mainframe.example.com session0.port=23 session0.type=tn3270 session0.model=3             # 80x32; use appropriate model number session0.ssl=false session0.timeout=30000 

• For TN3270E enable protocol if needed: session0.tn3270e=true

4) Connect using Jagacy API (Java example)

• Typical connection flow:

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import com.jagacy.util.;
import com.jagacy.session.;
Jagacy j = Jagacy.create();
Session session = j.open(“session0”); // name matching your config
session.connect();
session.waitFor( “logon prompt or screen pattern” );
session.send(“userid”, true); // true = enter
session.send(“password”, true);

• Use waitFor with exact screen text or coordinates; use getText(row,col,len) to read fields.

5) Configure keymap & screen model

• If you need custom keys, provide a keymap file and reference it in jagacy.properties or load via API.
• Ensure model matches host expectations (3278-2/3/4/5 etc.) so screen coordinates align.

6) SSL, certificates, and host verification

• To use SSL/TLS (TN3270E): set jagacy.ssl=true and session.tn3270e=true.
• If using self-signed certs, disable host verification only for test environments (check Jagacy docs for property name to skip verification).

7) File transfer and IND\(FILE</h3> <ul> <li>If host requires file transfers, enable IND\)FILE support per Jagacy docs and confirm transfer size limits.

8) Logging, timeouts, and retries

• Set jagacy.debug=true for troubleshooting.
• Configure timeouts (connect/read) in session properties and implement retries in code for transient failures.

9) Packaging and runtime

• Bundle jagacy3270.jar and jagacy.properties in your application jar/classpath.
• Run with a compatible JVM (Jagacy commonly tested on Java 8; confirm version for your Jagacy release).

10) Useful checks after configuration

• Verify you can telnet/TN3270 connect to host from the machine (telnet host port).
• Confirm charset/model produce readable text.
• Test automated logon, a simple read of a known field, and a proper logoff.

If you want, I can generate a ready-to-run sample project: pom.xml, jagacy.properties, and a Java class that connects, logs on, reads one field, and logs off.