[incubator-hop-docs] 26/42: Inital stub for webhop docs

[mc...@apache.org]

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commit eff0efe2beb7be5a916cd5ce43d716a20b5c0415
Author: Hans Van Akelyen <ha...@gmail.com>
AuthorDate: Tue Nov 10 09:00:26 2020 +0100

    Inital stub for webhop docs
---
 .../modules/ROOT/pages/webhop/developer-guide.adoc | 22 ++++++++++++++++++++++
 .../modules/ROOT/pages/webhop/index.adoc           |  3 +++
 2 files changed, 25 insertions(+)

diff --git a/hop-dev-manual/modules/ROOT/pages/webhop/developer-guide.adoc b/hop-dev-manual/modules/ROOT/pages/webhop/developer-guide.adoc
new file mode 100644
index 0000000..2130b12
--- /dev/null
+++ b/hop-dev-manual/modules/ROOT/pages/webhop/developer-guide.adoc
@@ -0,0 +1,22 @@
+= Developer Guide
+
+== Methods to avoid
+
+
+=== Display.getDefault() is not allowed
+
+See https://www.eclipse.org/forums/index.php/t/805303/
+
+____
+RAP is multi user framework by its nature. Every user session is
+associated with a display. In RAP, Display#getDefault() will not create
+a new display when it's called from non-UI thread - read
+Display#getDefault JavaDoc. When you execute a code in a background
+thread, RAP needs to know for which UI session (display) it belongs.
+That's why you have to provide the correct UISession/display from outside.
+____
+
+[source,java]
+----
+Display.getDefault() cannot be used in non-UI thread with RAP/RWT.
+----
diff --git a/hop-dev-manual/modules/ROOT/pages/webhop/index.adoc b/hop-dev-manual/modules/ROOT/pages/webhop/index.adoc
new file mode 100644
index 0000000..cbdedac
--- /dev/null
+++ b/hop-dev-manual/modules/ROOT/pages/webhop/index.adoc
@@ -0,0 +1,3 @@
+= Index Page
+
+* xref:webhop/developer-guide.adoc[Developer Guide]