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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0; padding-top: 10px"> <span class="diffcontext">You may all have achieved Borg Perfection, but I haven't. So without an available edit button I'll just have to elaborate further in a comment.<br /><br />These are the mappings for which {{hbm2ddl}} generates {{NOT NULL}} constraints, despite my doing everything in my power to have these columns made nullable instead:<br />{code:title=BadThing}<br /> @OneToOne(optional = true)<br /> @JoinColumns({<br /> @JoinColumn(name = "id", referencedColumnName = "thing_id", nullable = true, updatable = true),<br /> @JoinColumn(name = "current_thing_data", referencedColumnName = "created", nullable = true, updatable = true)<br /> })<br /> @MapsId("id")<br /> private BadThingData currentData;<br />{code}<br /><br />Generated schema:<br />{code}<br />sql> show columns from bad_thing;<br />FIELD | TYPE | NULL | KEY | DEFAULT<br />ID | BIGINT(19) | NO | PRI | (NEXT VALUE FOR PUBLIC.SYSTEM_SEQUENCE_85A1C07C_67FF_454A_B608_465214803984)<br />LOCK | INTEGER(10) | NO | | NULL<br />NAME | VARCHAR(255) | NO | UNI | NULL<br />CURRENT_THING_DATA | TIMESTAMP(23) | NO | | NULL<br />{code}<br /><br />And similarly for my tree-structure, where the root node _must_ have a null parent:<br /><br />{code:title=BadItemNode}<br /> @ManyToOne(fetch = FetchType.LAZY, optional =</span> <span class="diffremovedchars" style="background-color:#ffe7e7;text-decoration:line-through;"> false</span> <span class="diffaddedchars" style="background-color:#ddfade;"> true</span> <span class="diffcontext">)<br /> @JoinColumns({<br /> @JoinColumn(name = "tree_id", referencedColumnName = "tree_id", nullable = true, updatable = false),<br /> @JoinColumn(name = "parent_id", referencedColumnName = "item_id", nullable = true, updatable = false)<br /> })<br /> @MapsId("id.treeId")<br /> private BadItemNode parent;<br />{code}<br /><br />{code}<br />sql> show columns from bad_item_node;<br />FIELD | TYPE | NULL | KEY | DEFAULT<br />ITEM_ID | BIGINT(19) | NO | PRI | NULL<br />TREE_ID | BIGINT(19) | NO | PRI | NULL<br />PARENT_ID | BIGINT(19) | NO | | NULL<br />{code}<br /><br />I have generated workarounds with entities {{Item}} and {{ItemNode}}, but I am thinking that these are different examples of the same underlying problem.<br /><br />Full class definitions with failing JUnit tests are included in the attached Maven project. (Note that the JUnit tests for the workaround entities run correctly).</span>
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